Inquiring Minds

For Mark Ruffalo, environmental activism started out with something to oppose, to be against: Hydraulic fracturing, or fracking. It all began when the actor, perhaps best known for his role as Bruce Banner (The Hulk) in Marvel's The Avengers, was raising three small children in the town of Callicoon, in upstate New York. At that time the Marcellus shale fracking boom was coming on strong, even as the area also saw a series of staggering floods, each one seemingly more unprecedented than the last.In response, Ruffalo launched Water Defense, a nonprofit that takes on fracking and extreme or unconventional energy extraction in general (from mountaintop removal mining to deep sea drilling), and does so with a focus on grassroots activism. In the process, he's become quite the visible spokesman. But if you think Ruffalo is just another celeb with an anti-corporate tilt, you're missing the story. His true passion is promoting a clean energy solution to our climate and water problems, and demonstrating how feasible