By the middle of the 21st century per capita energy consumption in developed countries will presumably decrease by 40 45 and then stabilize reaching the stationary levels indicated in table 1 it is supposed that the level of per capita energy consumption that is higher than 25 toe is very comfortable for the citizens of developed countries. Geothermal energy comes from the earths crust engineers extract steam or very hot water from the earths crust and use the steam to generate electricity biomass includes natural products such as wood manure and corn these materials are burned and used for heat dams and rivers generate hydropower when water flows through a dam it activates a turbine which runs an electric generator
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