HISTORY

A part of the energy that reaches the Earth from the Sun is absorbed by the plants through photosynthesis, and converted into organic matter with a higher energy content than mineral substances. In this way, every year produced 2·1011 tons of dry organic matter, with an energy content equivalent to 68000 million toe (tonnes of oil equivalent), which is approximately equivalent to five times the demand energy mundial.2 in spite of this, its enormous dispersion makes that only a minimal part of the same exploits. The most notable forms of biomass for their energy use include energy fuels (cane sugar, beet, etc.) and waste (agricultural, forestry, livestock, urban, sewage sludge and computers, plants, etc.)