Helium.com | Ecology & Environment | Global warming: Cause and effect http://www.helium.com/knowledge/111477-global-warming-cause-and-effect.xml Helium.com > Ecology & Environment > Global warming: Cause and effect en-us Copyright Helium.com Mon, 05 May 2008 19:39:55 GMT Mon, 05 May 2008 19:39:55 GMT Early research on the "greenhouse effect" started in the late 19th century with work by Joseph Fourier. The further study and subsequent understan... http://www.helium.com/items/1648315-global-warming-cause-and-effect Thu, 12 Nov 2009 18:08:58