This drought isn't only affecting the Southwest.
In fact, it's just a warning of what climate change could do to the entire country, and eventually, the planet. As this NASA video explains, the past decade has been the hottest ever recorded since global temperature records began 150 years ago. A big part of this temperature increase is due to greenhouse gases emitted by human activities, like burning fossil fuels in our cars and power plants.
Humans didn't cause any of this, and we can't stop it either. We may be using too much water, but we aren't affecting the overall climate. The surface of Mars is getting hotter - who's causing that?
the only thing i feel sorry about at this point is that we're currently taking a lot of other species and habitat down with us (the holocene extinction) and it's only going to get worse. OTOH there's still about 500m years left for the earth's atmosphere to support complex life. so i hope it comes back strong one day... minus us clever dumbasses.
good luck with that, kiddos. :)
Basically man-made climate change is a load of horsebollocks.