1. Natural Energy Resources
This includes the fossil fuels (coal, crude oil, natural gas, oil, and tar sands). ... NONRENEWABLE ENERGY RESOURCES Crude oil, natural gas, and coal have formed the basis of industrialization. Today crude oil and its by products account for almost 40% of the commercial energy. ... Nonetheless, it is clear that oil is a resource and that oil reserves are very unevenly distributed among the world's countries. ... Although the consumption of coal declined as the use of petroleum expanded, coal remained the single most important domestic energy source. ...
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