Lake Powell and Lake Mead are two massive man-made lakes and they're reservoirs for water used all over the West--for agriculture, residences, industry, electricity, and wildlife. And they're running low on water--we're taking out more than they're being replenished. Brian Richter, president of Sustainable Waters, and author of the book, Chasing Water: A Guide for Moving from Scarcity to Sustainability, talks about the roots of the problem, and what we can do about it.