Researchers have found that volcanic activities "masks ... the effects of global warming by 25%." [1] The sulfur dioxide emitted from the volcanoes rises to stratosphere and chemically reacted with the air there. The resulting sulfuric acid reflects sunlight and thus cools down the earth. The research explains why global warming seems to slow down from the year 2000 to 2010, [1] ending the debate from the global warming skeptics.
References:
[1] THE TIMES OF INDIA, "Volcanoes mask effects of global warming by 25%: Study" 2013. [Online]. Available: http://timesofindia.indiatimes.com/home/environment/global-warming/Volcanoes-mask-effects-of-global-warming-by-25-Study/articleshow/18804881.cms [Accessed: 5 March 2013]
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