Emissions Scenarios - IPCC

Summary Discussions and Recommendations 309
3000
О
a
в
о
S
о
-£
s«
о
О)
2500
2000
1500
1000
High > 1800 GtC
AIC&AIG
(Л1П)
A2
AIB
B2
Bl
1S92 range
>
"s
a
s
и
"«
О
H
500 -
1990 2000 2010 2020 2030 2040 2050 2060 2070 2080 2090 2100
Figure 6-8: Global cumulative emissions (GtC, standardized). The ranges of cumulative emissions for the SRES
scenarios are shown. Scenarios are grouped into four categories: low, medium-low, medium-high, and high emissions. Each
category contains one marker scenario plus alternatives that lead to comparable cumulative emissions, although often through
different driving forces. The ranges of cumulative emissions of the SRES scenario groups are shown as colored vertical bars
and the range of the IS92 scenarios as a black vertical bar. (See also footnote 2).
Scenarios grouped by
cumulative emissions
Low
Medium-Low
Medium-High
^igh
16
14
12
10
Bl
32
AlB
A2
Cumulative Total
Carbon Dioxide
1990-2100
40 Scenarios within
4 scenaiio families
(Al,A2,Bl,B2;and
A1G & A 1С
(AlFI)
scenario groups
(AIB.AIC, AIG, AIT;
A2;B1;B2)
Ranee GtC
Figure 6-9: Global cumulative CO2 emissions of the SRES scenarios. Relative positions of the marker scenarios and the Al
scenario groups are shown on the histogram. The 40 SRES scenarios have median cumulative emissions of about 1500 GtC.
(See also footnote 2).