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% (316→346 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 | ||