The film is about an incredibly important subject, and one that I frequently bring up, only for people to dismiss me.
We are running out of clean water.
Right here in the USA.
The Colorado River is now a trickle compared to what it was only a few decades ago. If you want to know what the US will be like in a few decades, look at India.
This is a very good film, although the filmmaking style borders on propaganda, there is a lot of science to back it up. It's on Amazon Instant, and I believe on Youtube.
EDIT: From today's NY TIMES.
DO NOT SEE THE FILM ON AN EMPTY STOMACH!!!
Eat sushi beforehand. The filmmaking is very good, and the subject is a very interesting character. Highly recommended, and it's on Netflix.