Staging Sustainability

A volunteer with Clean Vibes helps sort recyclables at Bonnaroo in Manchester, Tenn.

If you've ever attended a major summer festival then you know that in addition to the good vibes lingering in the air, there’s also tons of garbage left behind when the exhausted masses make for the exits.

 For years, American festivals have been making efforts to reduce their environmental impact, offering everything from water-filling stations to compostable dining ware and low-emissi...