This guy is ahead of the fresh water depletion curve. I applaud him for his foresight. There is no more or less water on the planet than was present a  billion  years ago. But now there are almost 8 billion humans depending on drinkable water of  which there is less and less. Some nations already are greatly suffering. Don't worry about "saving the planet" because of climate change. It has and will survive anything we can throw at it. We should all start worrying about not having enough clean water, however.