In this July 16, 2012 file photo, corn stalks struggle from lack of rain and a heat wave covering most of the country lie flat on the ground in Farmingdale, Ill. as the nation's widest drought in decades is spreading. Global warming makes feeding the world harder and more expensive, a United Nations scientific panel said. A warmer world will push food prices higher, trigger "hotspots of hunger" among the world's poorest people, and put the crunch on Western delights like fine wine and robust coffee, the Intergovernmental Panel on Climate Change concluded in a 32-volume report issued Monday, March 31, 2014. (AP Photo/Seth Perlman)
Read: Global Warming Worsens Food, Hunger Problems
In this July 16, 2012 file photo, corn stalks struggle from lack of rain and a heat wave covering most of the country lie flat on the ground in Farmingdale, Ill. as the nation's widest drought in decades is spreading. (AP Photo/Seth Perlman)
In this Aug. 29, 2011 file photo, bins of pinot noir grapes are loaded onto a trailer after being picked at the Game Farm vineyard on the first day of harvest for Mumm Napa in Oakville, Calif. (AP Photo/Eric Risberg, File)
In this Oct. 7, 2013 file photo, workers collect red grapes in the vineyards of the famed Chateau Haut Brion, a Premier Grand Cru des Graves, during the grape harvest in Pessac-Leognan, near Bordeaux, southwestern France. (AP Photo/Bob Edme, FILE)
