Alternative energy can be considered to be any source of energy that is not derived from fossil fuels. Such sources are often considered to be more environmentally friendly.
Some common alternative energy sources are:
Solar energy – directly from the sun
Wind energy – from wind
Hydroelectric power – from flowing water
Geothermal energy – water heated naturally within the earth’s crust
Nuclear energy – energy from the spliting of atoms
Wave power – from sea waves
Biofuels – from fermentation of dead biological matter
and Fuel cells – produced electrochemically from mixing chemicals
