A man walks on concrete blocks used for hurricane and Sargassum algae protection in Cancun, August 14, 2015. Mangrove swamps, which form a natural barrier against hurricanes have been removed to make way for hotels and other buildings. Fewer mangroves lead both to coastal erosion and greater risk of damage when hurricanes strike, according to CEMDA, the Mexican Center for Environmental Law. (Photo by Edgard Garrido/Reuters)
