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An assessment panel created by the [[United Nations]] is 90% sure that most [[global warming]] is caused by human beings.

An assessment panel created by the [[United Nations]] is 90% sure that most [[global warming]] is caused by human beings.

The idea that human activities such as the combustion of [[fossil fuels]] can significantly warm the earth's atmosphere is called the [[runaway greenhouse effect]].

The idea that human activities, such as the combustion of [[fossil fuels]], can significantly warm the earth's atmosphere is sometimes referred to as the enhanced greenhouse effect.

==Relation to current climate change==

==Relation to current climate change==

The '''anthropogenic global warming theory''' is one of several explanations for the slight warming of the earth's [[atmosphere]] recorded since the middle of the 19th or 20th centuries.

The '''anthropogenic global warming theory''' is one of several explanations for the approximately 1.2 degrees F warming of the earth's surface recorded since the beginning of the 20th century.

The theory enjoys broad based political support from Liberals, Greens and the US [[Democratic Party]], and theory supporters frequently assert the existence of a "[[scientific consensus]]" favoring their viewpoint (see [[Politics of global warming]]).

The theory enjoys broad based political support from Liberals, Greens and the US [[Democratic Party]], and theory supporters frequently assert the existence of a "[[scientific consensus]]" favoring their viewpoint (see [[Politics of global warming]]).