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 animal and plant matter through geological eras. Their production is extremely slow – much slower than the current consumption rate – and therefore, not renewable on the human timescale.
Anthropogenic emissions
Anthropogenic emissions
Emissions produced as a result of human action. For example, large amounts of carbon dioxide are being released into the atmosphere by activities such as the burning of fossil fuels, agriculture, cement making, and so on.