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 sometimes referred to as the [[runaway enhanced greenhouse effect]].
==Relation to current climate change==
The '''anthropogenic global warming theory''' is one of several explanations for the slight approximately 1.2 degrees F warming of the earth's [[atmosphere]] surface recorded since the middle beginning of the 19th or 20th centuriescentury.
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]]).