Al Jazeera: The last five years have been tough on Tye Baker, the director of Water Resources for the Choctaw Tribe of Oklahoma. First, there was the drought: frighteningly little precipitation from the end of 2010 until the spring of 2015. Then there was heat: 35 straight days of temperatures above 37 degrees Celcius in 2011. Then came the flooding: torrents of rain, 30cm at a time, during the summer of 2015. Through it all, it has been up to Baker to ensure that the Choctaw people have clean, drinkable water...