Technicians prepare a plane for artificial rainfall at the Wujiaba Airport in Kunming, Southwest 皇冠体育app's Yunnan province, March 3, 2012. Since December 2011, the drought ravaging Yunnan's 15 prefectures and municipalities, has left 3.19 million people and 1.58 million livestock short of drinking water, according to the provincial government. [Photo/CFP]

A plane is ready for artificial rainfall at the Wujiaba Airport in Kunming, Southwest 皇冠体育app's Yunnan province, March 3, 2012. [Photo/CFP]

A plane is ready for artificial rainfall at the Wujiaba Airport in Kunming, Southwest 皇冠体育app's Yunnan province, March 3, 2012. [Photo/CFP]