|
|
Table 1.
Climate forcings today and proposed
50-year changes
|
|
| Forcing agent |
Forcing,
W/m2 |
Proposed change |
Forcing change,
W/m2 |
|
| CO2 |
1.4 |
1.5
ppm/year (75 ppm) |
+1.08 |
|
|
+1.5%/yr growth (111 ppm) |
+1.54 |
|
|
+1.5%/yr (devel. countries) |
+1.28
|
| CH4 |
0.7 |
 30% (1740 1400 ppb) |
0.21
|
| N2O |
0.15 |
+67% (316346 ppb) |
+0.10 |
| Trop.
O3 |
0.5 |
30% (of anthropogenic
O3) |
0.15 |
| Strat. O3 |
0.1 |
70%
(of current strat. loss) |
+0.07 |
| CFCs |
0.35 |
40% |
0.14
|
| Trace |
0.02 |
+500% |
+0.10 |
| Soot |
0.6 |
50% (of
anthropogenic BC) |
0.30 |
| Sulfate |
0.8 |
30% (of
anthropo. sulfate) |
+0.24 |
| Organic |
0.3 |
50% (of fossil
fuel organic) |
+0.06 |
| Sum (1.5 ppm/year CO2
growth) |
+0.85 |
| Sum (+1.5% annual CO2 emissions
growth) |
+1.31 |
| Sum (+1.5% growth, developing countries
only) |
+1.05 |