Not sure if they’ve done an episode about envirowhackos, but they probably have. Carbon credits is a good episode idea.
Enviromentalist have been covered. Some of the recent episodes involve SMUG (liberals take to smelling their own flatulence while a perfect storm of smugness rises from San Fran and engulfs the entire country), rain forests (more diseases come from rain forests than cures for diseases/ Kenny finds a girlfriend) and Global Warming/NOLA floods (Stan’s leads an expedition to save the world from globalwarming/cooling which he thinks is launched by the flooding of a town). That’s just some of the parodies.