Climate change

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.

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Forestation

Forestation

It is the conversion, directly induced by the humans, of land that has not been forested – for a period of at least 50 years – into forested land through planting, sowing, and/or human-induced promotion of natural sources of seeds. This definition is used for...

Fossil fuels

Fossil fuels

Fuels such as oil, natural gas, and mineral coal – fossilized plant residues – that are buried in the Earth's crust and reached their present state through chemical reactions over long periods of time. They are produced by the continuous decomposition of organic...