TULARE, CA - February 10

A drone, or unmanned aerial vehicle (UAV), hangs above Vincent Rodriguez as he explains how it can be used to monitor field health at the FarmSolutions exhibit on opening day of the World Ag Expo on February 10, 2015 in Tulare, California. Even as California moves into its fourth year of historic drought that caused farmers to leave hundreds of thousands of acres of cropland fallow last year, forced some well water-dependent communities to go dry, stressed wildlife and heightened political tensions surrounding water issues, farmers are attending the largest ever World Ag Expo. The expo is the biggest of its kind, attracting an estimated 100,000 visitors from 70 countries to view cutting-edge agricultural technology and equipment at 1,500 exhibits spread across a 2.6 million-square-foot of exhibit area. It is held in one of the most important food producing areas of the nation. (Photo by David McNew/Getty Images)

Credit: David McNew / stringer