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The '''anthropogenic global warming theory''' (dubbed "'''man-made global warming'''") holds [[human being|human beings]] responsible for most of the slight [[warming trend]] seen since the [[Little Ice Age]]. The anthropogenic global warming theory is one of several explanations for the 1.5 degrees [[Fahrenheit|F]] of warming of the earth's surface recorded since 1850.<ref>[http://www.cru.uea.ac.uk/cru/info/warming/ Climatic Research Unit Sheet #1]</ref> However, [[Greenpeace]] co-founder [[Patrick Moore]] said [[global warming]] is most likely a "natural phenomenon," because there is no [[proof]] of man-made global warming, and suggested that "[[alarmism]]" is driving politicians to create bad [[environmental]] policies.<ref name=greenpeace>Jonathon M. Seidl. [http://www.theblaze.com/stories/greenpeace-founder-questions-man-made-global-warming/ Greenpeace Founder Questions Man-Made Global Warming], ''[[The Blaze]]'', Posted on January 20, 2011.</ref>  

The '''anthropogenic global warming theory''' (dubbed "'''man-made global warming'''") is a [[pseudoscientific]] theory which holds [[human being|human beings]] responsible for most of the slight [[warming trend]] seen since the [[Little Ice Age]]. The anthropogenic global warming theory is one of several explanations for the 1.5 degrees [[Fahrenheit|F]] of warming of the earth's surface recorded since 1850.<ref>[http://www.cru.uea.ac.uk/cru/info/warming/ Climatic Research Unit Sheet #1]</ref> However, [[Greenpeace]] co-founder [[Patrick Moore]] said [[global warming]] is most likely a "natural phenomenon," because there is no [[proof]] of man-made global warming, and suggested that "[[alarmism]]" is driving politicians to create bad [[environmental]] policies.<ref name=greenpeace>Jonathon M. Seidl. [http://www.theblaze.com/stories/greenpeace-founder-questions-man-made-global-warming/ Greenpeace Founder Questions Man-Made Global Warming], ''[[The Blaze]]'', Posted on January 20, 2011.</ref>  

The idea that human activities, such as the combustion of [[fossil fuels]], can significantly warm the earth's atmosphere is called the enhanced [[greenhouse effect]].<ref>[http://zebu.uoregon.edu/1998/es202/l13.html Global Warming]</ref>

The idea that human activities, such as the combustion of [[fossil fuels]], can significantly warm the earth's atmosphere is called the enhanced [[greenhouse effect]].<ref>[http://zebu.uoregon.edu/1998/es202/l13.html Global Warming]</ref>