FILE - In this Dec. 4, 2012 file photo, oxen skulls brought 

FILE - In this Dec. 4, 2012 file photo, oxen skulls brought by Brazilian farmers to represent animals killed by this year's drought lay at the feet of security agents outside Planalto presidential palace in Brasilia, Brazil. In 2012 many of the warnings scientists have made about global warming went from dry studies in scientific journals to real-life experience. (AP Photo/Eraldo Peres, File)
Associated Press
FILE - In this Dec. 4, 2012 file photo, oxen skulls brought by Brazilian farmers to represent animals killed by this year's drought lay at the feet of security agents outside Planalto presidential palace in Brasilia, Brazil. In 2012 many of the warnings scientists have made about global warming went from dry studies in scientific journals to real-life experience. (AP Photo/Eraldo Peres, File)
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