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Feds warn climate change could harm giant sequoias

U.S. researchers warn that warming temperatures could soon cause California's giant sequoia trees to die off more quickly unless ... <p><a href="http://rssfeeds.usatoday.com/~a/usatoday-NewsTopStories?a=Vqa0ck"><img src="http://rssfeeds.usatoday.com/~a/usatoday-NewsTopStories?i=Vqa0ck" border="0"></img></a></p><img src="http://rssfeeds.usatoday.com/~r/usatoday-NewsTopStories/~4/384148518" height="1" width="1"/>