Extreme Energy (sometimes written Xtreme Energy) is a term used to describe a group of energy extraction methods that have emerged in recent years as the availability of fossil fuel resources has become more constrained. As more usual methods of extracting fossil fuels fail to provide the amounts of energy that civilisation demands governments and corporations are taking increasingly extreme measures to feed these demands. Examples of these extreme methods include Tar Sands, Mountain Top Removal, Deep Water Drilling, Coal Bed Methane and Shale Gas. Other non-fossil fuel energy extraction methods such as agrofuels and a new generation of nuclear power stations, whose introduction is also being driven by the same pressures, are also sometimes considered part of the extreme energy sector.