What if the devastating drought in the western U.S. doesn't end? A few years ago, the science fiction writer Paolo Bacigalupi started exploring what could happen.
"Lake Powell and Lake Mead were hitting historic lows, and they weren't re-filling the way they were supposed to. Las Vegas was, in fact, digging deeper and deeper intakes into Lake Mead," he remembers. "This question of scarcity. This question of too many people needing too little water."