\.-"r

I

E*g1t Arrror." o*o ,*o,*.r*,*o
e.o. Box

I
)

.o,tro*"

07932

Cable: ENGREXXON, N.Y.

M. 8. GLASER
Manager
Envi ronmenta

-

1o1, FLoRHAM PARK, NEwJERSEY

I Affai rs Programs

November

- co^

L2,

L982

"Greenhouse" Effect
82EAP 256

TO: See Distribution List Attached
Attached for your information and guidance is briefing
material on the CO2 "Greenhouse" Effect which is receiving increased
attention in both the scientific and popular press as an emerging
environmental issue. A brief surTnnary is provided along with a more
detailed technical review prepared by CPPD.
The material has been given wide circulation to Exxon
managernent and is intended to familiarize Exxon personnel with the
subject. ft may be used as a basis for discussing the issue with
outsiders as may be appropriate. However, it should be restricted
'to-Exxon personnel and not distributed externally.
Very truly yours,

7ls //*
M. B.

IIIBG:

rva

Attachments

GLASER

I{.

F,l.

WEINBERG

NOV 1

5

i98Z

 

 

Distribution List:
R. w. cohen
M. J. Connor, ilr.
E. E. David, Jr.

c. u. Eidt, Jr.

W. R. Epperly
R. L. Hirsch

T. G. Kaufmann
G. Levine
It. I"ong

D.
G.
J.
H.

R. Riley
R. Savage

A. Schriesbeim
iI. F . Taylor
D. T. Wade
H. N. Weinberg

 c0 - NGREENHOUSE EFFECTN

z

PRC:::-:A.RY

SUilUARI

Atuospherlc toonltorlng prograEs shon thc leve1 of carbon dlorlde 1n the
attrospbere has lncreased about 8l ovcr thc last tHenty-flve years and not,
stands at ebout 3q0 ppn. lttls observed lncreasc ls bclleved to bc tirc contluuatlo! of a trcnd rblcb began ln thc olddlc of thr last century sl th thc
start of thc Industrfal Revolutlon. Fossll fue1 coobustlon and the clcaring
of vlrgln forests ( deforcstatlon) arc belleved to b! thc prlnary anthropogcnlc
contrl.butors althougb the rclatlvc contributlon of cach 1! uoc.rtaln.
Thc carbon dloxlde conteDt of tbc atDosphere ls of concern !1Dce t! caD
affect gl,obal cllnate. Carbon dtoxldc and otbcr trace gases- eontalned ln
the atDosphere such as sater vepor, ozoncr r0ethaDe, carbon Eonoxldc, oxldcs of nltrogen, etc. absorb part of the lnfrared rays.reradlated by the earlh.
Tbls lncrease tn absorbed energy uaros the atnosphere inductng HarBlng at the
earthrs surfacc. lbls phenooenon 1s referred to ss the ngreenhousc effcctn.

Predlctlons

- ngreenhouse

of the cltratologlcal

ltopec! of a carbon dloxlde
effectn draH upon varlous DEtheDetl,cal Dodels to

lnduced
gauge lhe !eo-

perature lncrease. The sclentlflc cooDunlty geocrall.y dtscusscs the bpact
ln terDs of doubllng of the current carbon dlortde content lD order to get
beyond the nolse leve1 of thc det8. lle cstlnate doubllng could occur arormd
the year 2090 based upoa .fossll .fuel requlrencnts projected 1r Erronrs long
range energy outlook. thc questlon of rbl.ch predlcttons and nhlch oodcls best
sLEu:.atc a carboa dloride lnduced elLroate cbaage ts stlU bclng debated by
thc sclentlflc co@unl.ty. Orr best estlnate ls tbat doublhg of the^currcnt
congeDtrarion could lncrrasr average global tcBperatur! by about l.Je to
3.1oC. lbc lDcreasb so-uld not Ua nn t.ior.n over tbe earthts surfacq nlth tbe
polar caps llkcly to sce terp€rature lncreases oa thc order of lO'C and thc
eguator llttle, lf any, lncrcase.

Consldcr'able uniertalnty elso surrounds the posslble lnpact on soc!,ety of such
a rirnlng trend, should lt occur. A! the Lor cnd of. tbe prcdlcted teoperature
rangc there eould be sooe. Lupact on agrl.crrltural groyth and ralnfall patterus
rrhlch could be beneflcl.al in soEa reglons and delrl^nental ln othcrs. At tbe
hlgh end, sone sctentlsts suggest there could be conslderable adverse lnpact
lncludlng lhe floodtng of soe coaslal laDd Easses as a result of a rlse ln
sea level due to DeItlDg of the AntarctlQ lce sheet. Such an cffect nould
not lakc placc untll centurlc! afler a 3lC gtoUat averege t€Dperaturc
Lncreas€ actually occurred.

ls currently no unanblguous sclcntlflc cvldence that the earth ls
warolng. If the earth ls on a warrlng trend, uerre not 11kely to detect 1t
before 1995- llrls is about thc earllest proJectlon of utten the teoperaturc
there

EC-11-5/ A3

 i.

-2trlght rlse the O.5o needed to get beyond the range of noraal tenperature
fluctuatlons. On the other hand, lf clfunate oodellng uncertalntles have'
exaggerated the tenperature rlse, lt ls posslble ttrat.a carbon dloxlde lnduced
trgreenhouse effectn oay not be detected untll ?O?O at'the earllest.
Tbe ngreenhouse effectn ls not 1lkely to cause substaqtlal cllnatlc cbanges
untll the average global tenperature rlses at least log above todayrs levels.
Thls eould occur ln the second to thlrd guarter of tbe nert century. goreyer,
there ts concern atrong sone sclentlfle groups thab once ttre effecti are
neasurable, they nlght not be reverslble and llttle could be done to correct

the sltuatlon tn tUe short tero. Therefore, a nrnber of envlronnental groups
are calllng for actton now to prevent an undeslrable future sltuatloo fioo
developlng.

Hitlgatlon of the ngreenhouse effectn nould regulre naJor re?uitlons 1o fosstJ
fuel conbustlon. Shlfting between fossll fuels 1s.not a feaslble alternatlve
because of ltnlted long-teno supply avallablllty for cArtaln fuels although.
o11 does produee about 18i less carbon dloxlde per Btu of heat released thau
coal, and gas about 321 less than o11. The energy outlook suggests synthetlc
fuels will have.a negllglble Lnpact at least through the old 21st eentury
lcontrlbutlng less than fil of the total carbon dloxlde released
frm fossll
fuel conbustlon by the year 2050. Thls low 1evel lneludes the expecled
eontrlbutlon froo carbonaLe deconposltlon rhlcb occurs durlng shale o11
recovery and assuues essenttally no efftelency lmprovenents
processes above tbose currently'achlevable.

in

synthettc. fuels

Overall, the current outlook suggests potentlally serlous cllnate problens
are not llkeIy to occur untlI the late 21st cenlury or perhaps beyond at
proJected energy denand'rates. Tlrls sbould provlde tlne to resolve uncertalntles regardlng'the'overall earboo cycle and the contrlbutlon of fossll fuel
conbustton as rell as the role of tbe oceans as a reservolr for both heat and
carbon d1oxlde. It should also allon tlne to better deflne the effect of
carbon dloxlde and other lnfrared absorblng gases on surface cltoate. ldaklng
slgnlflcant changes 1n energy consr.uptlon patterDs nor to deal rlth thls
potenttal probleo anld a1I the sclentlflc uncerlalntles would be prenature 1a
vlew.of tbe severe lnpact such noves could have on the norldrs econonles and
soctetles.

EC-1

1-5lA4

 -."

PROPnIETANT I}IFOR}IATION
FON AUTHONIZED COI{PANI USE OTILT

.

CO^ GNEENHOUSE EFFECT
I

A TECHNICAL

PREPANED

REVIETI

BT

THE

:

COORDIIIATIOil A}TD PI.ANNING DIVISIOI{

EiCIOII RESEANCH AIID ENGII{EEBIIIG CO{PAI{I

APnrL

EC:11-5/A2

1,

1982

 -1CO^ GREENHOUSE EFFECT
z

A TECHNICAL

REVIEW

TABLE OF CONTENTS

PAGE NO.

BaCkgfOUnda .. .. . ... . ... .. ...

o

t. ... . o. . .. ... o.. ... . o. o.. ... . .. . o. ..

Sources and Dispositlon of Atnospherlc Carbon Dtoxide Thil CanbOn Cyele.. o ... o.. ... ... . .. ... ... ... ... . .. ... . . o . .. ..

o

...

.

2

. .o..o

6

MaJor Rgsgarch Prograns Underway. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

15

Future Energy Scenarlos and Ttrefr Potentlal Impact on AtnosPherlc
CafbOn DlOXldg... . . o . .. . .. . . . .!. ... . .. ... . .. . o. . .. .. . . .. . ..'. .. ...

17

Desorlptlon of.Potential Inpact on lleather, Cllnate' and
Land AVa1lablllty. . . . . . . .. . .. . .. . .... . . . . o r .. .. . . .. o .. . .. . ..

Forecagt Based on Fossll FueI ProJected !n Exxon Long Range
.... o.............
.........
Enefgy O,ttIOOk..... ... r...........
Induced Greenhouse Effect..............
Detgctlon of -a COo
z

o

o...

r........

o

1g

26
30

EC-l1-5/A5

 -2c02 cREEllnousE

EFFECT

Background

:
-

contlnuously' af
the butldup of co. ln the atoosphere has been Eonltored
I s (llOM) Observatory 8t
AdDtnlstratloo
the Natlona1 Oceaflc and Atuospherlc
Hauna Loe, Hanall, and perlodtcally 1n other places since 1957. In addltlon
to observlng a trend between 1957 -1979 that strowed atEospherlc co2 lncreaslng
fron 315 to 33? ppn, Keellng and others a13o observed a seasonal ?arlablllty
ranglng froo 6 lo 10 pp betreen a lox at the end of ttre suDDer growing season
(aui to phoeosynthesls) and a h!.gh at the end of ntnter (due to fossll f\rel.
burnlng for heat, aDd bloDass decay). rhere ls 11!t1e doubt that these observatlons tndleate a SroFlh of stEosPherle CO" (see F!'gure 1). It ls also
belleved that the Srowth of atEospherlc Cor-has beeD occurrtng since the
niddle of the past cenbury, 1.e., coincldefit r{'ltb the start of the Industrlal.
the at[osBevolutlon. I?rere ls, however, Sreat uncertainty as to wbether
Dherlc co^ concentration prlor to the Industrlal Revol.utlon (ca. ' 1850) ras
)go-goo pfin uhlch one would arrlve at by assuulng atoospherlc C0" Srowth ls
due to fossl1 fuel burnlng and ceoent Danufacturlng, ot 260-270 lpu based on
c'arbon Lsotope EeasureEents ln tree rlngs. The lnfortatlol- 9n. c9z concentratlon prlor to 1850 i3 lnportant because lt rroul d helP establish the valld1ty
of cliroatlc predlctlons nlth respeet to the tnceptlon of a CO2 I'nduced
tgreenhouse effectn.

effecti refers !o the absorbtlon by CO2 and otber trace
in the al66sphere (such as rater vapori ozone, carbo6 Donottdel
6rldes of nltrogen, freons, and netlrane) of part of tbe lnfrared radlation
$hlih ls riradlated by the earth. An lncrease ln absorbed energy vla thls
route nould iarn the earthts surface csuslng cbaages 1n cllEate affectlng
atDospherlc and ocean teEperatures, ralnfall Patteins, solI uolsture' and over
?he ngreenhouse
gases-conlained

.

cenbuiles potentially ueltlng the polar tce caps.

relatlve contrlbutlons of bioloass oxldation (nalnly due to deforestatlon)
fossll fuel cornbustton go the observed atsospherlc COr increase are
not loom. Ttrere are falrly good lndlcatlons that tbe anfiual gronth of
ataospherlc CO; ls oo lhe order ot 2.5 Lo 3.0 Gtlar of carbon and the net

Tbe
and

quantlty of caFbon absorbed by the ocean.ls siu11ar1y 2.5 lo 3 Gtla. 1bu3,
these tuo slnks (atDosphere and ocean) can account for the total fosslI carbon
burned (lncludlng 0.3 GIC/art frm ceuent nanufaeturlng) which ls on the order
of 5-6 Gl/a and does not alJow nuch rooo for a net contrlbutlon of bloness

r Gt/a = glgatons per annun = 10' Detrl8 tons per year.
tt GtC/a = glgatons carbon per annun = 10' netrlc toDs of carbon Per year.
EC-11-5/ A6

 Eii

o

:9

az

:3

-_a
EE
c

EP

9.9
=-5

c;!

-9€
Zg
c3

il

!:
9;.

-iE
=a
ZB
cl=
a=

>E
Ec
oo

EI

gc

oa
t-u

o8
(J5
cE
BI
i
a

I

*s

Eg
ac

r€

EE

EE
i ::'a

E;'
aio

:t!
c
I

t
t!

€B

tIT

t

 -4carbon. Yet, highly resp€cted sclentlsts such as Hcodwe11, Bolln and others
have postulaled a net blonass contrlbutlon to atDospherlc C0. that ranges
froo 1 to perhaps 8 GL/a ot earbon. Drrlng 1980, a nrnber of dlfferent groups
Produced ner estloates of the contrlbutlon of organlo. terrestlal fl [es to
atoosphertc C0r. A consensus has not been reached, but esttsates of the
net annual terFestlal blosphere eolsslons to the at&osphere noH range betueen
a 4 GtC/a source and a 2 GtCla slnk. Flgure 2 al@Earizes the Cluxes and
reservoLrs for the carbon cycle. rt should be noted that the net blosphere
contrlbutlon nas assuued to be 0-2 Cte/a.
rate of forest clearlng has been estfuoatqd 4f 0.5/ Eo 1.51 per yeaE of the
exlstlng area. Forests occupy about 50 x 10-h' out of about 150 x lOekn< of
contlnental land, and store about 650 Gt of carbon. Gre can easily see that
lf 0.5t of tbe rprldrs forests are cleared per year, ttrls could contrlbute
about 3.0 Gt/a of carbon to the ateosphere. Even lf reforeqtaH.o! $ere
contrlbutlng slgnlf1cantly to balanclng the C0, froE deforestatlon, tbe
total. carbon stored 1n nelt trees tends to be ofily a s6a11 fractlon of the net
cerbon eoltted. It sbould ie noted, however, that the'rate of forest cl.earing
and reforestatlon are not loonn accurately at thl. s tiue. If deforestatlon is
indeed contributlng to atoosphertc cOr, then another slnk for carbon uust be
- found, and the Jmpaet of fossil fuel 6ust be considered in the conbext of sueh
The

.

a

'

.

slnk.

the Eagnltude of the carbon flIuxes shom ln Figure 2 betlreen,tbe atuosphere and
the terrestlal biosphere'. and the atoosphere and the oceans are not precisely
knom. lhe flor of csrbon between these reservolr palrs ls generally asslud
to h€ve been ln equlllbrltn prlor to the rndustrlal Revolutlon. lbwever, the
errors in ihe estlnated Eagnitude of these BaJor filuxes are probably larger
than the oagnltude of the estlnated Een-Ead e carbon fluxesi 1.e., fossll fuels
and deforestatlon. Ihe.nan-nade f,Luxes ere assEed to be the onl.y ooes that
have dlsturbed tbe equlllbrluu tbit ls belleved to have dlsted before the
rndustrial Revolutlon, and they can be estloated lndependenU.y of tbe naJor
fluxes. tlre nan-oad e carbon f,lures are balanced ln Flgure 2 betneen the krom
gror./th rate of ateospherlc cerbon and the oceans. fhe carbon f,tux to ttre
atnosptrere ts 6Gt/a froo fosstl fuels and ce&ent nanufacturlng (cenent nanufaeturlng contrlbutes about 4t of non-blospbere anthropogenle carbon) and
2Gtla llon deforestatlon, rrhlle 4ct/a return to the ocean, resultlng Ln a 50!
carbon retentlon rate 1n the atuosphere. Ore cannot rule out, ln vlen of the
lnherent lnrcertalnty of the uaJor flrxes, that tbe blosphere nay be a Det slnk
and the oceans Eay absorb nuch less of ttre nan-nade COr.
ProJectlons of scl.entlsgs actlve tn the .area lndlcate that the contrlbutlon
deforestatlon whlch Day have been subStantlal 1n the past, rr111 dtnlnlsh
ln cooparlson to' lhe erpected rate of fossil fuel coDbustlon ln the future.
A few years ago a nrober of scienttsts hypothesl zed that a doubltng of the
anount of carbon dlorlde ln the atoosphere could occur as ear).y as 2035. !?rls
hypothesls ts generally not acceptable anlmore because of the g1oba1 curtallnent of fossll fuel usage. Glculatlons recently co@pleted at Exxon Research

of

EC-11-5/L7

 TICURE 2

';

Almrisphete

Combusllon

Photo-

0:2

I

(650) Blota

Sirrlace
(39,000)

FossllFuels

and $hale

Terreslrlal
Blosphere

lnlermedlale,

Deep Ocean
and Sedlments

Oceans

( I = Size ol Carbon Riservolrs ln Bllllons ol Motrlc Tons ol Carbon
Fluxes (alrows)

Exchange ol Carbon Belween
= Melrlc
per
Tons ol Carbon

Reservolrs ln Bllllons ol
Year

I

 -6and Englneering CoEPany uslnS the energy ProJecttoBs froE the'Corporate
plannlng Deparinent r s 21s! Century Studyr, lndlcate that a doubllng of the
1g7g atoospherlc CO. concenlratton could occur at about 2090. If synthetla
fuels are not Oevel5ped and fossll f-ue1 needs are net.-by new 8as and petrofeuD
dlscoveries. tben the atDosPherlc Cor doubllng tloe nould be- delayed by
about 5 years to tbe late 2o9ot3. Ftgure J sunoerlzes the proJected groFth
of atnosDherle co^ concentratloa based oa the Erxoa 21st ceotury study{lgh
Growth sienarlo, 5s well. as an estlnate of the average globa1 teoperature
lncreaae Hhlcb Elght then oceur above the current tenperature. It ls nor
clear that the doubtfng tlDe r'i1l occur nuch later ln the future than PreviousJ.y postulated beeause of the dccreaslng rate of fossll fuel usage due

to lorrer

denand.

and Land Avallab1l

rhe nost ridely accepted calculallons carrled on tbus far on the PoteDt!.af
lBpacg on clluate of doubllng the carbon dloxLde contedt of the atDosPhere
use general. circulatlon Eodels (GCI). ltr;se Eodels lndlcate that an lncrease
1n giobal everage tetsperature of 3- I 1.5-c ts oost likely. $rch changes
.ln tenperature are expected !o occur rith uneven Seographlc dlglributlon rith
- greatei iramlng occurrlng at tbe hlgher latltudes, 1.e.' the polar reglons.
ittts ls due to lncreased absorptlon of solar radlatlon energy on tbe darker
polar gurfaces that Hould becme eXposed Hhen lce and SnoU cover nelt due to
increaslng legpereture (see FlEure 4). :here bave been othei calculatlons
uslng radlatlve convectlve nodels and energy bslaDge uodels wttlch ProJec!
average te&perature lncreases on the order of 0.75-C for a doubllng of
' CO^. these calculations are c@Pared ln Flgure 5- Flgure 6 suonarlzes
pogslbte beDperagure lncreases due to varlous cheD8es ln atnosPberic C0,
concentratlon.

If the atnospherlc CO, content had beeD 295 PW prlor bo the IndustrlaL
Revolutlon, ,and an av€rage g1oba1 teoperature Lncrease above clloate nolse
general
ls detectable at the present tine, thls r+ould add eredlblltty to theppn
prlor
and
been
265
c0.
concentratton
lf
the
Honever,
_clrculatlon nodels.
g.F-C
to the Industrlal Revolutlon, then dete6tlng a tegPerature effect of
now xould iuply that the tenPerature for a doubllng of C02 ltould b: 1.9-CA
fhe proJected tenperatures for botb afternatlves faII wlthln the l- 3 1.5-C
rang-. Tenperature proJecttons for alternate scenarlos wl11 be dlscussed
later

.

Cllnate nodeling Has studled by a coDBlttee of the Natlonal Research Councif '
chalred by Jules G. Charney of HIT, aod the concluslons are suErnarl.zed 1n
places ln lbls report
ffi't-sfcentury Studyr referred to here and ln other12030
study!. rhe neH
the
ca1led
study
enerSy
has been superseded by a ner
flSures but
the
earll.er
than
lower
study projects energy deoands that are
'
of
thls report.
not suificlently dlfferent to change eny of the conclusions
Ec-11-5/A8

 -7-

Figure

.3

GROWTH OF ATMOSPHERIC CO2 AND AVERAGE. GLOBAL
TEMPERATURE ]NCBEASE AS A FUNCTION OF TIME

C'

E
CL
4
ul

o

i

IIJ

v)

uJ

()

500

9

=
tg
tc
f
F

o

z

I
E

450

c,
uJ
A

c)

I
;I

=
F
UJ

420

UJ

o

G

U)

cE

o

uJ

F
=

300
1960

YEAR

 f i<rure

,l

,

Temperature Change (og) gvs 1.
Doubl lno COr Concentrations

Basis;

Cornputod by

the

U.

S.

Nat

ional Oceanic and Atmoepheric Adminigtration uuing their general circulation
2

mode1,

x CO2-Standard

Stratosphere

oII

Tropopause
o

!
:'

a

Surlace
900

Pol e

800

700

600

500

400

300 200

100

Latltude
Decrease

0o
Equa

ln

Temperature

tor

 Fl.gure

5

Change in surfacE air temperature (oKl

o

0.5 1.0 1.5 2.O 2.5 3.0 3's
a a aoa
..ot..
a

Radiative
_' convectNe
models

.

EnergY

balance
models

a a

14

al '

a

a.

a

GCMs
Thc chrngc in globally rvcngcd surfece eir rcmperrture rcsulting from

Ji.&i;r.*in".aii, oacrOr L.tioo. -a 4oUtt.i*rl6oa
".Jii
(Jnivcrsity
Tcchnicd RcPort no. l.)
Strtc

r doubling of etno:phctic Co; l! givcn by I
(GCM) rnodeb. (Froqr . L' Gatcs. Orese!

t

 ..-t0Figure

5

Estimates of the Chaage in Global Average Surface Tenperature
Due to Various Changes I-n CO2 Concentratioa.' Shading Shows
Present Range of Natural Fluctuatioas

6

5

f4
-c

v

G'

CN

0

aE

TT

C'g
1ql

-3

-[

3C

L

€,

CL

E2

6J

o,
c)
(,
G'

0

b

=
u,

v

1

I
0

*
-1

o

600

300
-

COz @ncentntion

900
-

pprflY

1200

1500

 Flgure

?

WETTER

I

t',
I

El wrttor thon nor

Irrmplc ol r rtcwlo ol porrlblc roll moltlurc prllcrot on r rrrtncr ttrlh. ttlt btrcd on prhocllinrllc rc<onrlrucllonr of lhc
Allhhcrnrl tcrlod (al00 lo lo0 ycrt ttol, tornprdroor ol ra.col rrrrn lnd (old ycrnin lhc Northcrn Hcm6phcrc, rnd I
dlnrlc rnodcl crptdncnl ltor r-dlrcurdoo ol lhsc rourccl ol lnlornttlon rc AiFrdtr C., Whcr. tr" oi 111'ot. oi rhcrc
..oltt(cr lttcc on aha dl.acllorr ol lhc tiln'o rrc htrc lodlolcd lhc rrte ol rlriircrrt slrh r derhcd lnc rnd r bbcL

 -

11

-

nCarbon Dloxlde aod C118ate: A Selentlfle Assessoent.t
Ttris Natlonal Research Councll study coocluded that there are DaJor unceftalnttes in tbese node1s ln terrns of the tlEing for a doubllng of COr and the

tfrefr report tilIed,

resultlng teEperature lncrease. lhese uncertalntles -.center aroufid the therDal
capaclty of tbe oceans. The oceans have been assuoed to e,onslst of a'relatiiely thlo, re11 nlxed surface layer averaglng about ?0 Eeters ln depth ln
oos! of the general clrculatton uodels. and tbe transfer of heat lnto the deeP
ocean ls essenllaIly tnflnltely slow. lbe Charney panel fe1t, honever, that
the aount of heat carried by the deep ocean llaa been tmder estiroated and tbe
oceans ri1l. slou thd tenperature lncrease due to doubllng of atBosPheric
CO^. Itre Ctrarney group estlnated that tbe delay ln heatlng resultlng fron
th6 effect of the oceans could delay lhe expected tegperature lncrease due to
a doubllng of CO. by a fen decades. Accordlngly ' the tlEe Hhen the teloPerature lncreases dfscussed above are reached Eust be assuned !o have occurred at
an lnstantaneous equl1lbrluu.

.
'
,.

Along with a tenperature increase. ottter c11aato1o31ca1 chanSes are expected
to occur lncludlng an uneven globaL di.strlbutloD of increased ralnfa11 and.
inereased evaporatlon. These dlsturbances ln lhe exlstlnS global Hater distributlon balance Hou1d have dranatlc isPaci on soll uolsture, and ln turn,
on agrtculture. Becently, M,anabe et a1 ., uslng CcHrs calculated that lhe
zonal Dean value of sol1 Eolsture Ln surdoer decllnes s18nlf1cantly 1n tr.o
separate zones of Elddle and h18h Latltudes ln resPoase to an lncrease in the
C0^ concentratlon of air. Tlris CO, lnduced suuuer dryaess results not
onfy fro6 the earller ending of th€ snounelt season, but also frotr ttle earller
occurrence of the sPrlng to sunner reductlo! ln ralnfall rate. the forDer

effec! is partlcularty loportant ln hlgh latltudes, whereas the latter effect
becoEes lEportant lD Elddle latltudes. other slatlstically slgnlflcant
changes lnclude large lncreases 1n bottt solI rclsture and runoff rates at blgtt
latltudes durlng nost of the annual cycle rrl tb ttre erceptloo of the stDler
season. Ibe penetrallon of noisture rlch' lram air lnto blgb latltudes l'3
responslble for these lncreases.
state-of-the-art ln cllnate uodellng al'1ons only gross 81oba1 zonlng
whlle soEe of lhe erpected results froro tenperature lncreases of the Eagnltude
lndleated are quite dranatlc. For exanple, areas that were deserts 4,000 to
The

(Htten tbe global average tenperature
present),
nay in due tLEe return to deserts.
was soDe 2'c hlgher than
Conversely, sore areas strleh are deserts nor Here forDerly agrlcultural
regLons. It ls postulated that part of the sahara Desert ln afrlca sas qulte
wet 2,OOO to 8,000 years ago. The ADerlcan Hldlrest, on the other band. rns
Duch drier, and it ls proJected that the Hidwest xould agaln becoe drler
should there be a tenPerature lncrease of the Eagnltude Postulated for a
doubllng of afioosphertc C0, (see Flgure ?).

8,000 yearg ago

-

ln the Altltherrnal perlod

In addltlon to the effects of clfu[ate on gIoba1 agrlculture, there are soEe
potentlally catastrophle events that tnust be consl'dered. For exaople' 1f
lhe Antaretlc lce sheet rtrlch 1s anchored on land should nelt' then thls
EC-l1-5/A9

 _

13 _

could cause e rlse 1n sea level on the order of 5 Deters. Such a rlse would
ceuse floodlng on Duch of the U.s. East coas!, lncludlng the state of Florlda
and i{ashlngton, D.c.
_Ihe Deltlng rate of polar 1ee is belng studled by a
nuEber of graclaloglsts.
Estloates for the oeltlng of the iest anarctlca 1ce
sheet range frotr hundreds of years to a ttrousand years. EtE[ns and EpstelD
observed a 45 no ralse in Eean sea leve1. rhey account for the rlse by
assu!01n9 that the top T0 n of tbe oceans has rlarred by o.3oc fron 1g90 to
1940 (as has the atoosphere) causlng a 24 un rlse ln sea ievel due to
expanslon. lbey attrlbut"_ghg lf't of the sea level rlse to neMng ofthetu8l
polar
lce. However, neIllrig 51 Tt (10''
Eetrlc tonnes) of 1ce nould reduce ocean
teEperature by 0.2-c, and erplaln nhy the global nean surface teEperature
has not lncreased as predicted by COA greeohouse theorles.

In

an Aoerl'can Associatlon for the Advancedent of Sclence (AMS) ancl Departoent
Energy (DOE) sponsored lrorkshop on the envlronoental and societal consequences of a possib]e c0, induced cl!0ate change, other factors such as
tbe
environnental effects of-c0, concentration on weeds and pests were consldercd.
The general consensus ms that these unBanaged specles rnuld tend-to thrlve
rith lnereaslng average global tenperature. rbe uanaged blosphere,
such as
agrlculture, nould also tend to beneflt frco alDosphertc co^ irorttr. thls is
consequenc"
.a,
?fnltFogen,
992 benefltlng agrlcurture, provlded ttre oftrir key nutrlents,
'phosphorous and
are present ln the rlght proportlons. airlcultural
- rater needs can be uet
by ner irrlgatlon techallues'tbat
iess rnter.
rn addltlonr wttb hlgher co, and hlgher teuperature condlglono,
""qui""the aoount
of erater needed by agrlcultfral plants Eay te reduced. rt 1s expicted ttrat
blosclence coltrlbutlons cofrld polDt tbe u8y for dealing rt tlr cl-toatoroglcal
dlsruptlons of the Bagnltud€ lndicated above. As a result of the rorkshop,
research 1n ll areas rras recooDended 3

of

t. co, fertlllzatlon courd have broad bcneflclal effects oD agrlcur,tuFe. . These effeets need to be studled in deeall and for i varlety
.-.-of plant, soll and clloatic condltlons.
2. &ere 1s a need for a fuller understandlng of the dynaDlcs of currents and raber nasses ln the Arctlc Ocean.
3. It 1s necessary to deter-olne rhetber there hras deglaclatl,on of the

l{est Ancarctrc 1ce sheet about 120,0o0 years ego ind whetber thls
caused a rlse rn global sea Ievels at that trni. rr ftrs occurred,
then ihe rnfor'atlon could serve as an analog
ruirr" Jegracratl,on.

4. rt is

"r

necessary to develop and use scenarlos Htllch lntegrate (a)
lnfor'etlon about popuratlon, resourcesr energy consunpilon
and fuel
nlxes; (b) bulldup of at.osptterlc cori (c) reiponse of'the crinate
syste.: (d) effects on varloug bioloflcal systens, especiarry agrrcu1!ura1, econoolc and social consequences, internatitnal and
lnterreglonal confllcts; and (e) poislble ieedback _on!-tn"""
forces.

EC-11-5/ A10

 -145,

6.

CO^ lnduced Harmlng ls predlcted to be nueh greater at the pol.ar
refions. lbere could also be posltlve feedback oechanlsas as deposlts of peat, contaLnJ.ng large reservolrs of organlc carbon, are
exposed to o:ldatlon. Siullarly, ttradng El.ght also release large
quantitles of carbon curreutly sequestered as Eethene hydrates.
Qrantltatlve esthates of tbese possible effects are needed.
'the Eost
Although all blologlcal systens are llkefy to be affected,
severe econoulc effects coulh be on agriculture. Ttrere ls a need to
exaEine nel]hods for allevlatlng envlronEental stress on renerable
resource productlon
- food, flber, aniBal, agrtcul,ture, tree crops,

etc

.

?. Inforoatlon exists on the relatlonshlp of cultlvated
.
.

and non-

eultLvated blones to clfuoatic fluctuattons. SiEllarly, there ls
conslderable infornatlon on the response of varlous nations and
econoElc aectors to clleatlc variatlons over the past fen hundred
years. Thls lnfornatlon, wlrlch ls eurrently scattered and not
r.urlfornly presented or callbrated, Ls thus of llnlted usefuLness.

8.
9.

10.

Studles

of clloate effects are recoEDended for the se8l-arld tropt6s
ln these countrtes and

because of the relatlvely large populatlons
b€cause of speclal sensltlvlty to c11nate.

eroslon, sallnization, or the collapse of
irrlgatlon systens) wltlch are recoooended for study'as lndlcators of
hor socleties respond, and holt they Elght learn to cope and adapt
Eore effectlvely to a shift lD global c1lnate.
Ttrere are

sltuations

.(so11

Research ls recomended on itte flIoH of lnforaatlon on risk perceptlon and declslou nakln! to and froo botb layoen and experts, the
physiologlcal aspects of understandlng and percegtlon, and tbe

factors that influence declslon naklng.

11'. fhere ls a need to be sure that rllfetiDer erposure to elevated C0,
poses no rlsks to the healttr of huaans or enlBals. Health effectsassociated rith changes 1n tbe clhate sensltlve paraneters r or
stress associated wlth clfunate related faElne or Elgration could be
slgDlflcant, and deserve study.

In teros of the socletal and lnstltutlonal, resPonses to an lncrease Ln COr,
the AAAS-DOE workshop partLclpants felt that soclety can adaPt to ihe lncFesse
ln C0^ and tttat thls probleu ls not as slSnlficant to lBanklnd as a nuclear
holocazust. or norld faElne. Flnauy, ln an analysts of the lssues assoclated
trlth econoolc and geopolltic?I consequences' Lt tras felt that society can
adapt to a C0. increase wtthln econonlc constralnts that will be exl'stlng ag
the tlue. 'So6e adaptlve Eeagures lhat were tesged nould not consuue uore tban
a few percent of the gross national Product estluated in the Eiddle of the
next century.
EC-11-5/A11

 -15Hajor Research PrograBs Under$ay

the DepartEent of Energy (DOE) whlch ls actlng as a focal polnt for the u.s.
governEeDt tn thls area ls plannlng to lssue tHo reports to the sclentlfle
iooounity and lo pollcy Eakers. I?re ftrst one, sle6arlzlng- five years of
study is due ln 1984, and th. secoBd oDe tn 1989. the current plan 18 to
lnvest approrlnately 1O years of research and assessBent prlor to recoEoendlng
polley declslon3 1n lhls area *h1ch lDpac! Sreatly on tbe energy Deeds and
ic"naitos for the U.S. and the rprld.' I?te strateglc eleuents of thc Unlted
Ststes netional tota). COz PrograE are suonarl zed ln Flgure 8.
uucb of the goverruoeBt sponsored effort to date bas focused oa dellneatlng
tlre research needed to enhance our understandlng of bhe PoteltXal problens.
AccordlDgly, a nuEber of rDrkshoPs and s)'lPosla uere held to th13 end' Itre
consensui of the key research needs ls suonarized ln Flgure_ 8 under the
headlng nResearch PrograD Rerul.ts. n To date, Eost of the research effort hat
been concentraged on the f!rs! t$o research categortes. It shoul.d be noted'
hoHever, that lbls research started ln 19?9 and tbere'are few results to
belng conducted at thls tlae ts calIed
report. the Eost aabltlous proJect
iSianslent Tracer ln the Ocean (TTO).tt Thls researcb' Jolntly funded by the
ls a 4H$ ProJect to lnvestlgate
DOE and the Nalional Sclence Foundatlon (ISF)
'
ulderstandlng of hott surfacc
the
ocean nixlng processes in order to enhance
1n0o lhe dFFp ocean"^ Tracers noroally found ln the
nater CO- ls olred
t*c,
5H, 5He, o'Kr and J'Ar, are oonltored 14 the North
ocean. s6ch as
Atlantic Ocean froB oceanographl'c veasels.

In addltlon to tbe E1:lng of surface uaters lnto the botton layers, carbon can
be added to deep uaters by lbe olldatloD of organlc Batter and tbe dissolutlon
of cal.clun carbonatr. In order to seParate these three processes and deteral.k3llBlty.
ulne thetr.relatlve slgnlflcance, prectse total, carbon dtoxlde'
gest
natheoatlcal
to
construct
and
aie
needed
data
and calclun concentratloa
oodels. Prellninary analysls of the 1lD1!ed dala lndlcates that (l) lateral
processes dor0lnale the dlstrl.butlon of calcltu and lnor8anic carbon ln thc
caleltu carbonate
i""p o"""o" array fron the polar reglons, (2) the anount ofprevlously
esttDated
dissoclated ln lhe deep oceans ls only a fractlon of tbe
tbe
deep
penetrated
lnto
farther
(3)
havc
COr
Day
excess
the
value, and
oceans tban the

currently avElfable Dodels predlct.

u1tlEate1y. CO^ ln the a1r should flnd lls nay lnto tbe deep ocean sedluents. As'curFently underslood, lhe deeper sedl.ents have thus far been
of the
l1ttIe affected by tbe fossil fuel era because of the slor B1xln8
$ater
shalloH
sotoe
that
contentlon
exaolned.the
ocean. A group of sclentlsts
provldl.ng
for
atoosphertc
a
sink
thUs
sedloents eoulb no11 be dissolvlng and
CO^, and concluded tha! the extent of dl'ssolutton ls not great enough to
hafe a large effect on the 81oba1 carbon cycle.
CO, concentratlon ln the alr
It nould bd helpful lf rellable estinates of thewtren-the
Dodern Deasurerents
yesrs
Eo
1957,
Prlor
could be obtatned for the
EC-11-5/ 412

 -r5-

a

r=E

t

!!:

!:

:r

i::

,=-

!!!-:

;:5J
i::-:
.54r5
i Ei:
i!:

a

-E
at

t:

4

gl

e
'ox

6>
ZP

"93
Eo
o

!oo
!zz
'.o<

fi.a
-A

EE
=,

EZ
t-tl

-

t:

t.i
E-;!

;5 ;

:ii

!i:!
l2=a
ii:!r

Es !*i;

::E

E3!3:

.:j

.^4--\
!

Es

.

;;
EE

!-n

:::_r; !i-:r'=i+i
=E:iiEiE

i;!:E:i: !!E#iE:s;

EstiiiF, i$j;t:
ij:

,t

-1>
<z
2,A

!.r
t!

9

z

1r
t,t

EE

tE :E:i, i*:ii!,
<a./a

;:

d i i

.r=2

d

E

: g
t-l l!:E
a3:i! t!

;:i!!ii

 _17

_

began. Ofd Selthsonlan AstroPhyslcal Observatory plates of the solar spectrun
iaien in the early tsentleth century Elght provlde such an opPortunlty tf they
coufd be proPerly lnterpreted. A uetbod for reduclng the data has been
developed and estluates of ttte C0, concentration should be aval1ab1e 4elt year.
As Eentloned prevlously, deterElnetlon of bhe CO, concentraLlons prlor to
the Industrlal Bevolutlon would help ascertain the v811d1ty of cllEate Eodelsr
and thus the U.kely teEperabure due to a doubling of atDospherlc CO2.
Antarctlc and Greenland lce cores to lndependently
in the nore dlstant Pest. Hhile lt ls
condentra.ions
estlBate the
content
of the dated ice cores, the results
CO.
dlfflcult bo ne6sure lbe
durtng the hel8ht of the last
C0,
concentratlon
suggest that the atoospherlE
years
been
about half lts present value.
agoJ nay haye
1cf-age (about 18.000
Thls is consl.stent H'1!h recently publlshed speculations derlved froo erarolnatlon of tbe eonposltlon of ocean sedlnent cores.

'Groups

ln

Europe bave used
CO^

-

There are currently aPProxlt0stely ll0 earboa cycle and cllnaLe research projecls in about 25 dlfferen! lnstltutlons. Hany of thebe proJccls are elther
supported jointl.y by the DOE and other agencies or etcluslvely by other
aglnctes. Tire 1982 Federal budget request for C0, research was 23.9H$. The
D6E, as the lead agency, wourd be atlocaied 1ll.oMt, ilsF 6.4H$, NgAlt 2.5H6. and
: the Departnent of AgrLculture 1.0M$.

Future Energy scenarlos and Ttrelr Potentlal Lnpact on Atuospherlc carbon

of future energy scenarlos have been studled ln relatlon to the c0,
probleu. these tDclude such un1lkely scenarlos as stoPPlng elI fossil fuelcoobustton at ttre 1980 ,ratc, looklng at the delay ln doubllng tlne' and
nalnlalnlng the pre-19?3 fuel Srofth r8te. other studles bavc lnvcatlgated
lhe narkei penetratton of non-foss11 fuel technologlesr such as nuclear, and
lts bDact on CO^. It shoul'd b€ noted, hotrever, that fuel technology rnuld
need alout 50 yeSrs to penetrate and achleve roughly half of the tolal narket.
Thus, even 1f solsr or nuclear technologles itere to be consldered vlable
alternatlves, they r{ould not really disPlace fossll fuel energy for the ne:t
40 Lo 50 years, and c0, growth Hould have to be estlDated based on reallstlc
narket dlspfaceEent ofthe fossll fuel technologles.
A nuEber

A draft report fron Hassachusetts Instltute of Technology (MfT) and Oak Rldge
(ORIL) aulhored by D. Rose and others consldered the societal and techno1ogleaI lnertla vls a vis declslon loaking on the CO, 1ssue. lhe C02 probleo
was consldered as the oaJor potential cbnstralnt on'fossil fuel usel It nzs
estbated ln the study that the C0, proble! Eay curtall fossll fuel use
before physlcal degletlon occurs. 'Considerable effort was devoted 1n the
study to noptlon space,n 1.e., Httat are the potential energy alternatlves,
hor long would lt take to lntroduee theo, and Hhat type of oaterlal resources
rrould be needed for effectlve Earket Penetratlon. 0n reviewing the rePort ne
addressed only the technlcal questlons relatlng to COr' and dld not evaluate
the plauslbl1lty of the scenarlos relallng to energy Ese 1n the future.
EC-11-5/413

 _18Ttle study consldered the

different levels:

lopllcatlons of llElting atEospherlc

addltlon
Rate of C0^
z
years.
5o

1.

to the atEosphere be 1i!01ted to

CO2

at

tno

450-500'ppo tn

2. the concentration celllng for atuosptlerlc COt be tn the range of
500-1000 PPo.
The rationale for choosing lbese llEits ls econonic. If tbe rate of CO2
Lncrease ls too rapld, then society nay not be able to econonlcally adapt to
the resultlng clinale change. Ihe second llnlt 1s based on a leveI rftere tbe
ham due to CO^ would greatly exceed the soclelal beneflts that Produced the
co^. the seeofd lfunlt can be ltlustrated as an assuEed ttrreshold for lnduclng
gr6at irreversible harn to our planet, sueh as causing a large ocean level
rlse due to oelting polar ice. In additlon to lEProvlng the use of energy
sources as a Eeans of gainlng tl6e to understand the Proble4, lt Has concluded
that'vlgoro-us developo6nt of non-fossll energy sourcel be lnl'tiated as soon as

posslble.

!o

be based on reasonable asstuptions but has an inherent
b.1as torrards the accelerated developnent of non-fossiJ. energy sources xhlch'
based on tbe present state-of-the-art   lnPlles nucl'ear eDergy.
The study appeais

In hls analysls. Rose lntroduced the concept of AIl (actlon tnj.tiatlon tloe) '
deflned as the tlue when pollcies to nodlfy or restraln fossil fuel use
actually slart !o be effeclive. Based on thls concePt' Rose proJects nonfossll grorlh rates of 6 lo 97/a over 40 bo 50 years in order to 11nlt atnospherj.c CO^ to 5OO to ?00 PpB. these rates can be put ln PersPectlve by
noting thaf sucb growth rates Here achteved for aatural 8as lntroductlon.
Houever r nuclear or solar sourcei rDuld have aevere restrlctl,ons because
such technologles are not as econoBlcally and polltical1y attractlve, tecbno-

logtca1ly gtralghtforward, and are encounterlng soclal and envlronoental
In addldion, Rose polnts out that the rate of growth of nanufacoppositlon.
-faciltties
requlred !o achleve a 6'97/a groYth rate 1n non-fossll fuel
turlng
power generatlon is so large that lt rould be equlvalent to inereaslng eaeh
year the u.S. power equlpBent DanufacturlnS caPabillty by an aooult equlvalent
to the current capaclty.
The study also indlcated -that otber energy-use-related greenbouse gases (vlz.
carbon nonoxlde, Eethane, and oxldes of nltrogen) oay signlfleantly contrtbute
to a global warntng. !{e belleve the contrlbutlon of these Sases to e global
warnlng ls hlghly speculatlve. Furtheroore, l{r0 ' tbe only oxlde of nltrogen
that could eonlrlbute to a global warulng ls pFodueed pr1oarlly by the nicroblal oxldatlon of annonia fron fertillzer use' and to a lesser extent froa tbe
coobustlon of fossil fuels. Addltlonal1y, Noo is nore reactlve than C0,
and

ls

EC-1

1-5lA14

expected

to

have a

relatlvely shorter'atnosPherlc resldence tiroei

In

 _19_
aslnllarveintdethanelsprluarllyeDl.ttedtotheetDospherevlathe
anaeroUfc ferointatlon of oiganlc Daterlal. The contrlbutlon of anthropogenlc
are lt to 101 of tbe
actlvltles (rnlnlng, tnduElrlal processes, and coubustton)
of nethane ls
destructlon
atoospberlc
lbe
iot"f "t o"pherlc Eethane sourcls.
and fornaldeyle1d
vagor
water
CO,
iore rapla tnan that of co' and tends to
foreatton
ozone
tropospherlc
to
tia.. i1so. Dethane ls Uefleved to contrlbute
anthopogenlc
to
can be traced
ly-oifaf"fni to COr. Ihe CO tn the atnosphere
of nethane (30f). ltre
oxidatlon
atnospherlthe
to
and
;";;;;-ito-a 6vll
conslder
iailr co sfnk 1s orldation (?o to 90t) to Cor' -One-can
lher:.fore
ultlnately
nethane
CO
and
Aecordingly,
COr.
prdcursors
to
CO-anO nettrane as
CO2.
fre-Nrg'
part
atEospherlc
of
as
contriUute Co eJ,lnagologlcal effec€s
ontheotherhand,EaynotbedtrectlyrelatedtofossllfuelEolbustloE.()nc
part
siiouia cuestron rhetnir the other ngreenhouser Sases should be consldered
conncctlon
regardlng tbelr
ii tir. iO^ orobleo ln vtex of the uncertalnttesirhether
thetr- effect crould be
tlDe,
tlris
at
clear,
not
ls
rt
l"
"i."gvtu'"".
ra C0 Z.
addltlve
Forecast

Fuel

Based

Exxonrs Long

R

ook

as part of the Exxon 2l3t centurv studv, ttte-rat".3f l:::.1I-1!:] 99a.""i*
Casen volunetric
,"" esttualed ln late 1981. sPeclfl'ca1ly, thehtas'HtEh
to estlr.ate tbe
used
DePartr1ent
"ioi"
Plannlng
a"i"-p"""la"O by the Corporate
con-verted to
data.Has
volleetrlc
pot"nif"f growtfi of atuospherlp CO^. The
for
HBtu/B
q's" 5'64
using 5'55
;;-;;;;;t iasts (Quaas/a = 1o') st6lvear)
a
addltlon'
In
for alf otber countrles.
frit"Te lor canaaa and 5.85 llBtujfB
prbary
.uslng
the
a consgant rate of 27.51 ot
shale proc"sslng loss r,as added
based on the assueptton thst above
t as
tbl.s
sha1e.
froo
qualitv
oif share ()30 gallons/lon) rourd
"n""gv-oon"urptron
hlslr
;;ili ;;;;;aing of relatlvelv
relaiL- i"oo"et"a dih a thernal elftclency of 801, and 1n-sl!u recoveryaof
rhet'nar
vtbh
rould be aecouplished
;i";it-;;; oti sbale (>15 sallons/ron) were
averaged over the U.S. resource
ot 651. These efflctencles
"irioi"iroy
;;;;tb arrr"e at ?e.5t. Table 1 suogarizes the Prl&ary energy consuDPtlon of
fossll fuels.
The lotal carbon dlorlde that can be eBltted frou prioary fossll fuels rns
estlnated uslng the followlng factors:

Ot1 = 1?0 lb
cas = 115 lb
Coal = 20?

lb

COrlHBtu = 21-0 l'ltCr/Qtrad.
CO^/llBtu
= 14.2 HtC/Quad.
z.
COrlMBtu = 25.6 l{lClQuad.

the
In addltion, ttte quantlty of carbon dloxide that could be eoltted froeestlnated
was
shale
processlng
o11
U.S.
deconposltlon of carbonate Blnerals ln
Uy avlraglng thls potentlally large CO, source over the GreeD Rlver foroation resource base. It should be nobei that Poorer shale resources tend to
mtffiI-ru on netrlc tons of carbon.
EC-11-5/A15

 ,

PRIMARY ENERGY CONSUMPTION OT' FOSSIL FUELS
2lst CENTURY STUDY--HIGH cAsE

Quads,/a

1979

Year

oil
-lT.s.
Canada
others

32.09
4 . 06
96.62

i

Totar
Gas

--T.s.
Canada
others
Total
Coal
-u.s.
Canada
others
Total

L37

-77

.

2000

201s

2030

2050

:.
33.32 ,. 32.01
4 .30
4 .7L
111.93
12S.16

35.35
5.62
139.63

36.35
6.09
t4B.5Z

36.80
5.g7

L3Z.7S

r9t.0t

Lls.sz

1990

14 9 .

55

164

.

ag

rB0.

60

20.95
1.83
30.88
53.66

17.93
2.5L"
55.54
75.88

17.24
2.88
74 .95:
95.07

.15.98
3.49
96.24
lo5.7o

t6.g7
4 .38
99.65
120.90

L7.42
4.73
log .68

14.69
0.80
60.17
75.66

2O.L4
I.37
81.44
102.95

29.66
1.90
103.90
134.54 ',

32.19
2.72
125;55
165.41

43,12
3.62
1?5.55
222.54

55.10
5.3S
261.14

130.83

321

I

Fossil Fuels
world Total
Rate

t/a

.59

267.09
328.38
3g4.4.g '
45r.?1
534.45
1.90
1.85
1.I3'
0.81
9.91

I

62i.g4

,!
o,

 -21 tluch more CO^ fro! cerbonate loinerals than tbe loore deslrable hlgh
quality resources for the saDe quantlty of shale o11 produced. It lfas further
assuned that 65t of tbe carbonate ldneral's decoDPose durlng processlng. ftls
very conseryatlve assuEptlon ls based on the average.of 1001 decooPositlon
that Eay occur ln thot spotsn during ln-situ recovery and 3Qt decoBPosltlon
tbat ls generally observed ln above ground retortlnE. lable 2 stnoarlzes the
total CO- produced Ln GEC/a, Please note that CO, eDlsslons resultlng
fron Co^'nlxed wlth natural 8as ln producing we113 can be substantlal' but
due Lo €he unavallablltty of quantltative data thts factor l{as assuled to
contrlbute about 5t addltlonal CO^ currently rislng to 151 ln the year 2050.
Thls trend of C0, eontaninatlon of natural 8as ls cooslstent with recent Euon

eEit

exper1'ence.

The contributions of sbale o11 to prluary fossiL fl)el energy and prlBary
fossll fuel carbon are sunDarlzed ln Teble 3. lttls !ab1e shot s that the
fractlon of shale o11 C0, euisslons to total C0, ls greater.'than the
corresponding contrlbutlSn of shale o11 energy €o total energy. Table 3 also
indlcales the breakdoHn between co, generated in Produblng and consuning
shale o11, and that due to carbonaEe olneral decouposltlon.

Table 4 presents the. estiEated total quantities of Cor eEltted to the
environnent as G!C, the grorbh of C0. 14 the atnospheFe ln ppn (v) ' and
average g1obal tenperaLure lncreare !n "C over 19?9 as the base year. In
vY,Jt
tt r.ra 3 essuned ttlat tbe
of i'rYYt..Y.
v.
atBosPherlc
4.e
bulldup
we--esl,
uI
ugl
to
99 estlEate the
order
-Y Coo,
pFE
ln 19?9. f?re fractton of
ras
COo
eonc-atratlon
33?
average atoospherlc 2
vag
!o
be
0.535 of the total fossll'
asstned
tn ttrezatoosphet':e
io^'
"I.*uf
"teo
fu6t CO-. Thts nuDber 1s derlved fron tbe observed hlstorlc ratlo of total'
;;;i"i rossu fuel. Co.. rnheren! ln thls nrnber ls the
"ii"""i3ir"-io^
tha€ bioaass and ceuen! prod6ctlon did not contrlbute to st4ospberlc
"""rrbtion
cO^. It should be noted. hoHever, that thls Dethod of calculatlon Hould
te6a to predic! total dnlhroPogenlc CO, as ]ong 8s the ratto of blonass and
cenent roanufecture to fossll fuel cons8nption reoalns constant. ltre average
teEperalure lncrease since 1979 nas estlEated, assullng Chat a doubltnS of
CO. nould cause an average g1oba1 tenperature lncrease of 3.0- 3 1.5-C. It nas
a16o assuned that fosEll fuel carbon Hould SroH at a rate of 0.87/a betneen
2050 ana 2080. r.trich ls a reasonable decrease froo tbe 0.977/a rate Projecled
betxeen 2030 and 2050. fhe fo oi lng section analyzes the lnpllcatlons of tfie
lenierature rise due to COA doubllng wlth resPect to lnltiaL detectlon of a
greenhouse

effect.

one variatlon of the Hlgh-Case scenarlo nas considered. It lras assuEed that
adequate quantttles of o11 and gas $ould be dlseovered to exactly natch those
estioated to be produced froa synthetlc fuels ln the Hlgh Case scenarlo. and
thus balance the prlnary energy needs of the 21st Century Study. Ibe net
quantlty of carbon that woul.d be saved ls s"nrrrarlzed ln Table 5. Itre lnplleatlons of the syofuel losses are conpared Hitb the Hl.gh Case ln Figure 3. I?re
overall lnp.act Ls rel.attvely nlnor.

EC-11-5/

A'-t6

 .

t.

TABLE2,

!

PRIMARY CARB9N DIOXIDE'(AS CARBON} FORMATION FROM FOSSIL TUELS
.21SC CENTURY STUDY_-HIGH CASE
.

Gtcr/a

L979
2.90

Year

oil
Inorganrc
.a

1990
3.15
0.01

2000
3.47
0.05

L6

.5?
1.35
0.L5

2015
. 3.79
0.19

2030
4.0I ' '
0.2'l

2050

.98
1.50
O.18

.28
L;72
O.22

4. 09

.68
4.24
9.90

I .94

2.L4

5.70
11.92

8.24

3.69

0.40

Carbon

Total

O11

Gas

in
COz
Tota1

Gas

Gas

Total CoaI
World

Tota1

Rate l/a

2.9O
0.76
0.04

l.0g
0.l1

0,80
1.93
5.63

l. Ig
2.64
7.00

3.

2.00

I .50

3.45
8.47
L.92

4

3

3

r
?l

1. 05

L.25

0.97

1.86
I

N
N

0.28

I

L4.47

0.80

 TABLE 3

OIL SHAIJE I'IQUID FUELS
PRIMARY ENERGY CONSUMPtTON EUO
CARBON DIOXIDE (ES CARBON} PRODUCTION
21st CENTURY STUDY--HIGH CASE

L979

Year

U.S. Shaler Quads/a
Other Shale

,.,--

Total

t Prlnary

--

Shale

EnergylPrlmary.

Foaall Fuels Energy
shale Carbon, ctc,/A .

1990

2000

2015

l.0I
0.2I

3.65
L.49

L4

1.21

5.14

0.35

t.3O

2030

20s0

.38 , 20.66
2.56
5.55

1I.10

16.94

26.2L

41. g9

3.?5

{.90

30.79

5.6t

.Toral

O.O3
0.01
o.o4

O.I1
0.05
0.15

0.36
0.19
0.55

0.55
O.27
0.82

1.28

t Prlnary Shale Carbon/Prfunary

0.55

I.89_

5.55

S.gZ

,

8.05

Carbonate

carbon

FoBsll Fuel Carbon

I

0.88
0.10

,s

?

 TADLE

4

ESTIMATED ATMOSPIIERIC CO2 CONCENTRATION AND
AVERAGE IrEMPERATURE INCREASE
2lst CENTURY STUDY--}IIGH CASE

Emitted,

Year

Stored in Atmosphere,.GtC

GtC

Incremental Cummulative

L979

Atmospheric

Concentration, ppm

7L5

j.

Average

ture
Increase, oC
'fempem

337

0

1990

69.3

6g.3

37.1

7s2

17.5

355

0

2000

77

.2

146.5

41.3

793

19.5

374

0.{5

137.5

284.0

73.6

857

34.7

409

0. 8r'

20L5

.22

I

2030

153.3

2050

263

2080

490.6

120r.4

262

2090

191.3

L392.7

102.3

.5

447 .3

710.

B

.4

954

4L.2

450

L.25

14L.0

109s

65.5

s16

1.

.5

t35B

L23.7

640

2.78

48.2

588

3.09

87

'ire

o

B4

N
F,
I

 TABLE 5
ESTIMATED INCREMENTAL CO2 CONTRIBUTION FROM
SvNTHETTC FUELS TO ATMOSPHERTC coi coNcENTRATToN
AND AVERAGE GLOBAL TEMPERATURE INIEETgE

'

Gtc/a
Year

'

Shale Loss

Carbonate DecomPositlon

Total Stale
r

2ooo

?!!!

2o3o

20s0

o;00{
0 . 0I3

0.025
0. 04 7

0.069
0. r8 6

0.114
9.2Q7

0.18r
0.39I

"ry
OIS
!,,oaa

Rate t,/a

Incremental CO.r'
z

GtC

-

GtC
CummulatLve CO,',
z

Incremental Atmospher!.c Corr PPm
Cummulative AtmospherLc Co2,

Net Atmospheric COzr

*ry

0;235

offi

2080

6m

0.067 0.135 0.276 0.s35
0.139 0.391 0.657 1.114'
0.03s
2-O
2.7
3.5
7.1
' l{.8
45.79
7.73 .1?-38
3.73
0.80
-

Coal Loge

Total Synfuele

1990

PFm

PPm

Average Temperature Increase,

oC

-

L2.26

29.64

75.43

o.8o

4.53

0.2

0.9

I'9

4'4

II'5

0.2

i'L

3'1

7'5 ,

19

3ss

37

4

407

.446

0.22

0.45

0.82

1.21

506
1.75

616

2.6L

r

N
l,l
 

 -26Detection

of a C02 Greenhouse Effect

a general cgnsenaus reSardlng the
greenhouse effeCt 11.llL not be
CO'
lnduced
llkelihood e;d teplicatlons of a
lncrease can be detected.
leBperature
reaehed untl1 sucl tlne as a slgnlflcant
ln
average global cllBate.
above tbe natural randoD teEperature flucluatlons
These flucluatlons are assured to be !0.5"C. the earllest that such dlscreet slgnals w111 be able to be nea l-red ls oae of the DaJor uncertalnties of

It ls antlcipated by uost. seientlstt that

the C0, lssue.

a nuEber of clfuoatologlsls c1aln that they are currently Beasurlng a teoperature sl.gnal (above cllnate noise) due to a c02 induced gtreenhouse effect.
rh1le the EaJorlty do not expect such a slgnai to be detectable before the
year 2OOO. In order to quantlfy the lnpllcatlons of detectlng a greenhouse
iffecl nor, as opposed to the year 2000, estlEales nere uade on te&perature
projections as a functlon of tbe co" concentration .that exlsted Prlor to the
concentratlon Prlor to ttle
inaugtr:.al Revolutlon. Avallable d5ta on CO,
-goups:
260 Lo 270 pP@ or 290 to
lnto
bwo
Revolution tend to faI1
. Induslrla1
Here
estlBated as a
3OO ppB. In Table 6, Posslble teloperature lncreases
of lnltial co^ concentratlons of 265 and 295 PPe. Teoperatules
- i,rnoiion
proJected for th;3"-;;;;,'"i".1-crj a-teoperaluri-lncreasl of 3oc
. were
obcur! ii current CO^ concentratlon doubles. (2) the greenhouse effect ts
debectable non (19?9f, and (3) the greenhouse affect 1s deteqted ln the year
2000.

Table 6 that lf a doubllng of at6ospheric CO2 ttll1 cause a 3oC
r13e ln tenperature, then ne should ltave seen a teEPerature-increase above
cllnate noi;e lf lnltlal CO^ coneentratlon nas 265 ppu' or be on the lhreshold
of delecllng such an effect<non. tf the inltial coDcentratlon r,as 295 ppo. If
He assuDe lhat we are on the threshold of detectlng a greenhPuse effect' tben
the average ieoperaLure due !o a^doubllng of C02 1111 be 1.9-C for an lnltlal
CO^ concentration of 265, ot 3.1'c for an 1nlt151 concentratlon of 295 Ppo.
F16aI1y, lf ttre greenhouse effect ls detected 1n the year 2000, tben tbe
doubltnr teupeiaiure for lnitlal C0^ concentratlons of 265 and 295 Ppo 11111 be
,t.3o anJ 1.?oC, respectively. Base6 on these estl6ates, one concludes that a
aouultng of current concentratlons of co2 n*u Probably not cause- an average
global ienperabure rlse Euch ln excess of 3'C, or the effect should be
Jeteeiable a! tbe present tlae. Alternatlvely, 1f the Sreenhouse effect ls
not detected untll ?000, then the tenperature due !o a c0' doubllng wlll
probably be under 2aC. Uslng the Exxon 21st Century Stud! as a basls for
due to
fossll fuel growth patterns, the everaSe global te8perature increases
C02
at'Eospherlc
of
doubllng
A
2030.
co- rrould ranre between 0.8 and 1.6'C by
CenEury
of
the
21st
rates
rofrfa U" extr;polated froo the fosslI fuel consuroPtlon
studv to occur at abgut the year 2O9O ulth the t€Eperature lncrease ranglng
u.t"u"n 1.3o and 3.1oC. The proJected range Presented6above ls eonsiderably
lower than. the generally accepted range of 1.5" to 4.5-C. Flgure 9 lllustrates
One can see

EC-1'-t-5/417

in

 TABLE

6

EFFECT OF PRE'INDUSTRIAL ATMOSPHERIC CO2 CONCENTRATION

ON

GLOBAT, AVERAGE TEMPERATURE INCREASE

llemperature,
Atmospherlc

'rtme

Co2

oC

DE EEC
-aef

295

(InBtantaneous
Equll lbr lum)

65

1,000

,v2L4O

4.3

4.4

2.8

4.6

1.9

2;5

800

p2LlO

3.6

3.6

2.3

3.7

1.4

2.L

674 (Doubling)

-2090

3.0

3.0

1.9

3.1

1.3

r.7

451

2030

1.7

1.5

1.1

1.6

0.8

0.9

375

2000

1.1

0.9

o.7

0.9

0.5

0.5

33? (Current)

1979

0.8

0.5

0.5

0.5

0.3

0.3

0

0.2

0

0.2

0

Concentration,

PPm

295

^rl8

0

0.3

265

-I850

0

5

0

,

0

 -tt:
Fiqure

.

9

of Gloial Mean Temperature From 1850 to the Present
with the Projeeted Instantaneous Climatic Pesponse to
- Increasing CO2 Concentratioas-.

Range

l-

)-;-.
3

v
I

o
.i

li

t,(d
:ot'

+

.o)g

!

.r!.o.c

ttuctu.aiions
including

€

.5 o
o0

t+t

t\L-

Range

.\\--

/

o

o

.

o

o0

-

(t-

ctranges without
Lo, effect (?l

-1

-!l

reso

t

l90o

of

\

fluctuations
(climatic noise)

v

---

-

I

natural

/P"rt

6

/

co2 effec.

./
-'/a"tt rC

F{

'F

/
/

i>
/ p,fat
,r'l:1,"":':l 1l

t

'

19sO 2000
Year

20s0

2100

 _29 _
the behavtor of the nean global tenperature froo 1850 to the present, contalned
rdthln an envelop scaled to lnclude the randgn tenpe5ature fluctuatlons, and
proJected lnto the t\rture to lnclude the 1.3- to 3.1'C range of uncertalnty
noted above for the CO, effect.
Dependtng on the actual global energy denand and supplY, 1t1-" po""fble tbat
sone of the eoncerns about CO, Erowtb due to fossll fuel conbustlon nay be
reduced lf foss1l fuel use lstdecreaseS due to hlgh prlee, scarclty,'and
unavallabll1ty.
The above dlscusslon assunes that an lnstantaneous cllnatlc resPonse results
froa an lncrease ln atrnosptrerlc GOo concentratlon. In actuallty' the
tenperabure effect nould llke1y Ia! the C0, change by about 20 years beeause
the oceans would tend to danp out tenperat[re changes"
Gtven the long tern nafure of the potentlal problen and the ulcertalntles
lnvo1ved, tt rould appear that there ls tlne for firther study and nonl'tortng
before speclflc acllons need be taken. At the present tl.ne, that actlon would
Itkely be curtallnent of fossll fuel consunptlon uhlch rculd undoubtedly
serlously inpact tlre worldts economles and socleties. Key Polnts needlng
.better deflnition lnclude the lnpact of fossll fuel conbuslon and the role of
-ttre oceans ln the carbon cycle and the lnteractlve effect of carbon dl'oxlde
and other trace atnospherlc gases on clluate-

EC-l1-5/A18

 -30BIBLIOGNAPHT

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alr

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Bacaston, R.' 8.., Keellag, C. D. 1973. Atoosgheric carbon dlorlde and radlo
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Bactr, W. 19?6. Global

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Bolsvert, n. N. 1975.
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Dept. Agrlc.
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atoosphere

Broeker, lf.
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ln

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l{. S.,
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Broecker.

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