This article from NPR explains why the effects of global warming may not have been noticeable during the past few years. The article warns that there are several factors, such as ocean currents and atmospheric water vapor levels, that mask the problem of rising global temperatures.
National Public Radio. NPR: Atmospheric Dry Spell Eases Global Warming. Washington: National Public Radio, January 28, 2010. http://www.npr.org/templates/story/story.php?storyId=123075836 (accessed 20 November 2014).
%0 Electronic Source %D January 28, 2010 %T NPR: Atmospheric Dry Spell Eases Global Warming %I National Public Radio %V 2014 %N 20 November 2014 %8 January 28, 2010 %9 text/html %U http://www.npr.org/templates/story/story.php?storyId=123075836
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