Non Renewable Energy
Non-renewable energy is energy, taken from finite resources that will eventually dwindle, becoming too expensive or too environmentally damaging to retrieve, as opposed to renewable energy sources, which are naturally replenished in a relatively short period of time.
Non-renewable sources of energy can be divided into two types: fossil fuels and nuclear fuel. Coal, oil and natural gas are fossil fuels. Other alternative non renewable sources include synfuel, oil shale and tar sands.
See the following sections in non renewable energy