| Recent Perturbations to the Global Carbon Budget | |
|---|---|
| CO2 sources | Flux (Gt C/yr) |
| Fossil fuel combustion | 5.5 ± 0.5 |
| Tropical deforestation | 1.6 ± 1.0 |
| Total anthropogenic emissions | 7.1 ± 1.1 |
| CO2 sinks | |
| Storage in the atmosphere | 3.3 ± 0.2 |
| Uptake by the ocean | 2.0 ± 0.8 |
| Northern hemisphere forest regrowth | 0.5 ± 0.5 |
| Other terrestrial sinks (CO2 fertilization, nitrogen fertilization, climatic effects) | 1.3 ± 1.5 |
| Source: Climate Change 1995, published by the IPCC | |