US-ENVIRONMENT-CALIFORNIA-DROUGHT

This picture taken from a helicopter shows aircrafts lining up next to fields of dead grass at the San Francisco International Airport in San Francisco, California, on July 23, 2014. One of California's worst droughts in decades could cost the US state's farmers $1.7 billion, a recent study warned. The drought could leave 14,500 workers without jobs in California's Central Valley, known as America's food basket for providing vast supplies of fruit, vegetables and meat. AFP PHOTO/Jewel Samad (Photo credit should read JEWEL SAMAD/AFP via Getty Images)