Climate Desk: For Mark Ruffalo, environmental activism started out with something to oppose, to be against: 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 his three small children in the town of Callicoon, in upstate New York. At that time the Marcellus Shale fracking boom was coming on strong and was poised to expand into New York, even as the area also saw a series of staggering floods, each one seemingly more unprecedented...