Why do we need alternative energy?
Fossil fuels are a limited resource. The deposits of coal, natural gas and oil will eventually run out. Alternative sources of energy will be needed to meet future energy needs.
Fossils fuels are named this because the fuels are made of dead buried organic materials. Coal is made from fossil plants deposits. These deposits are not being formed today and when the deposits are used up there is no replacing them.
Oil and natural gas are thought to have been formed from buried animals. The deposits of oil and natural gas are also non renewable energy sources. Dependence on these energy sources is an eventual dead end as someday the world will run out of oil and natural gas.