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.
Agroforestry systems
Agroforestry systems
Forms of land-use and land-management, in which trees or shrubs are used together with crop and/or animals in the same area, simultaneously or in a sequence of time. They must include at least one tree or shrub forest species, which can be combined with one or more...