| Gas | Pre-1750 concentration | Current concentration | Global Warming Potential (GWP) (100-yr time horizon) | Atmospheric lifetime (years) | Increased Radiative Forcing (W/m2) |
| Concentrations in parts per million (ppm) |
| Carbon Dioxide | 280 | 385 | 1 | 100 | 1.66 |
| Concentrations in parts per billion (ppb) |
| Methane | 700 | 1785 | 23 | 12 | 0.5 |
| Nitrous Oxide | 270 | 322 | 296 | 114 | 0.16 |
| Ozone | 50 | 36 | n/a | Hours/days | 0.35 |
| Concentrations in parts per trillion (ppt) |
| Sulphur hexafluoride | 0 | 6 | 22, 200 | 3, 200 | 0.002 |
| CFC 11 (trichlorofluoromethane) | 0 | 253 | 4, 600 | 50 | 0.34 |
| CFC-12 (dichlorodifluoromethane) | 0 | 545 | 10, 200 | 100 | 0.34 |
| Perfluoroethane | 0 | 3 | 11. 900 | 10, 000 | 0.34 |
