Biomass briquettes are made from agricultural waste and are a replacement for fossil fuels such as oil or coal, and can be used to heat boilers in manufacturing plants, and also have applications in developing countries. Biomass briquettes are a technically renewable source of energy and their emissions do not constitute an anthropogenic greenhouse gas, unlike emissions from traditional coal briquettes, as any carbon released was taken directly from the atmosphere in recent history, not sequestered deep in the earth during the carboniferous period as with coal.