Living organisms require available energy to stay alive, such as the energy humans get from food. Human civilization requires energy to function, which it gets from energy resources such as fossil fuels, nuclear fuel, or renewable energy. The processes of Earth 's climate and ecosystem are driven by the radiant energy Earth receives from the sun and the geothermal energy contained within the earth.
where does the energy for most external processes on the earth come from
the radiant energy Earth receives from the sun the geothermal energy contained within the earth