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| isbn = 0891810617
| isbn = 0891810617
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The main sources of energy at the beginning of the 21st century are divided into two types: nonrenewable ([[Oil as an energy source|oil]], [[natural gas]], [[coal]], [[tar sands]], [[oil shales]]) and renewable ([[nuclear power|nuclear]], [[hydroelectric]], [[geothermal]], [[solar]]).
The main sources of energy at the beginning of the 21st century are divided into two types: nonrenewable ([[Oil as an energy source|oil]], [[natural gas]], [[coal]], [[tar sands]], [[oil shales]]) and renewable ([[nuclear power|nuclear]], [[hydroelectric power|hydroelectric]], [[geothermal]], [[solar]]).
Sources of energy used by mankind have changed widely. Similar changes should be expected in the future. [[:file:AAPGSt54Figure1.JPG|Figure 1]] depicts the changes of energy sources over a 150-year period.
Sources of energy used by mankind have changed widely. Similar changes should be expected in the future. [[:file:AAPGSt54Figure1.JPG|Figure 1]] depicts the changes of energy sources over a 150-year period.
* [[Coalbed methane]]
* [[Coalbed methane]]
* [[Coal]]
* [[Coal]]
* [[Nuclear power]]
* [[Hydroelectric power]]
==References==
==References==