In this March 28, 2016 photo, Thai workers repair a dried up irrigation canal at Chai Nat province, Thailand. Much of Southeast Asia is suffering its worst drought in 20 or more years. Tens of millions of people in the region are affected by the low level of the Mekong, a rice bowl-sustaining river system that flows into Laos, Thailand, Cambodia and Vietnam.(AP Photo/Sakchai Lalit)