special correspondent tom casciato has the story as part of our ongoing series, "peril and promise: theenge of climate change." ♪ ♪ ♪ >> reporter: the grammy- nominated band my morning jacket is known for southern-tinged, moody rock, but, at this gig at new york's forest hills stadium, on frontman jim james' mind? climate change. >> i think people are waking up and starting to do more and more stuff, but definitely not at the speed that we need to. that's why we're trying to take more of a stance, partner with people like reverb, to try and get at least the people that are coming to our shows to, like, learn more and think more about it so that we can speed up the process of trying to deal with it. >> there's a one-to-one ratio from recycling and trash. >> reporter: reverb is the brainchild of adam gardner and his wife, lauren sullivan. >> we met at tufts university. i was a freshman. he was a sophomore. i saw him singing in his acapella group at my dorm orientation. i thought, gee, that guy's cute. >> reporter: did you immediately think, "someday, i will start an environmental organiza