A worker with the meteorological authority in Qingzhen city, Southwest China's Guizhou province, prepares a rocket that contains chemicals that spur precipitation to bring artificial rain to the drought-ravaged region, August 4, 2011. [Photo/CFP]

A worker with the meteorological authority in Qingzhen city, Southwest China's Guizhou province, prepares the launch pad for a rocket that contains chemicals that spur precipitation to bring artificial rain to the drought-ravaged region, August 4, 2011. [Photo/CFP]