Environmentalism also means an end to most of the world’s population, the ‘causes’ of Gaia’s increasing ‘sickness’ manifest in droughts, tsunamis, hurricanes, volcanos, etc.
Other than the fact that they're much more efficient at killing vast numbers of people (banning DDT, for example), they really haven't advanced much further than their ideological ancestors who tossed people into volcanoes to placate their "gods."