Changes that are directly or indirectly attributed to human activity and alter the composition of the world’s atmosphere and that is added to that caused by the natural climatic variability observed over comparable periods.
Greenhouse gases (GHG)
Gaseous constituents of the atmosphere, from natural or anthropic sources, that absorb and re-emit infrared radiation. The UNFCCC and Kyoto Protocol count for carbon dioxide (CO2), methane (CH4), nitrous oxide (N2O), and sulfur hexafluoride (SF6), accompanied by...