As music festivals pile up in the memory of North American summers, the environmental toll of all those plastic water bottles and plastic beer glasses and paper plates covered in chili cheese fry smear unavoidably piles up as well. Some festivals are coming around to their own kind of budget-friendly nods toward sustainability, while others plow ahead through the trash. Read a survey of those at least trying in the festival circuit via thump, and consider pushing the sustainability question with your wallet next summer.