FILE- Mongolian herders try to get a weak cow to move around to ensure it keeps itself warm, at the Hujirt soum of Uvurkhangai aimag in central Mongolia, March 10, 2010, after a number of livestock were killed by blizzards and extreme cold. An extreme weather phenomenon caled dzud, literally meaning disaster in Mongolian, used to occur once a decade, but is becoming harsher and more frequent as the world warms. (AP Photo/Ganbat Namjilsangarav, File)