CORRECTION
An error occurred in all language versions of the TAR Synthesis Report
in the vertical scale of Figure 7-3. The correct figure is shown below:
What will it cost to stabilize CO2 concentrations?
Trillions (10 12 ) of 1990 U.S. dollars
Gt C
18
1800
16
1600
14
1348
1400
1239
1200
12
1043
1000
10
8
800
714
6
600
4
400
2
200
0
450 ppmv
550 ppmv
Cumulative carbon emissions
between 1990 and 2100
650 ppmv
Models :
Scenarios :
FUND
S
WRE
750 ppmv
MERGE
S
WRE
0
MiniCAM
S
WRE
Figure 7-3: The mitigation costs (1990 US$, present value discounted at 5% per year
for the period 1990 to 2100) of stabilizing CO2 concentrations at 450 to 750 ppmv are
calculated using three global models, based on different model-dependent baselines.
Avoided impacts of climate change are not included. In each instance, costs were
calculated based on two emission pathways for achieving the prescribed target: S
(referred as WGI emissions pathways in WGIII TAR) and WRE as described in response to
Question 6. The bars show cumulative carbon emissions between the years 1990 and
2100. Cumulative future emissions until carbon budget ceiling is reached are reported
above the bars in Gt C.