Industrial revolution brought coal, a fossil fuel, to the forefront of the global energy scene. This was later overtaken by another fossil fuel, crude oil; and natural gas is trying fast to take Over the dominant role in the world energy supply mix. The increasing world-wide awareness And concern about the environmental impacts of fossil fuels coupled with the oil price shocks Of the early 1970s and late 1980s, and likely future price hikes, have lent enormous weight To a switch to renewable energy sources.
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