Last updated on April 17, 2014 at 21:23 EDT

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2005-10-14 05:00:00

Ancient plankton show tiny temperature fluctuations can have big effects, study says Some of the strongest evidence yet of a direct link between tropical warmth and higher levels of greenhouse gases is found in past climate records, U.S. researchers say. The current steady increase in tropical temperatures caused by global warming could have a major impact on global climate and result in more destructive storms like Hurricane Katrina, according to a team at the University of California, Santa...