Most of the eviro-weenies I know, the ones who take the hand wringing and gloom and doom too the extreme, as if every bit of phony bullshit they spout is 100% gospel, have little or no belief in God. I suppose this makes sense because you cannot worship two Gods.
Since there is no belief in God in the Church of the Environment, there is no afterlife, so what difference does it make if the earth explodes tomorrow? All memory of earth will vanish. It will be as if earth and the life it nourishes never existed. It simply won't matter. So what's the point? What are we living for and why are we trying to preserve life's environment?
Wouldn't it be better if we all returned to the state of consciousness we enjoyed before we were born. That is to say, a perpetual state of nothing. There would never be an unhappy moment for anyone again.
So, let's party like it's 2099 and to hell with the earth. The sooner it is all over with, the happier we will all be. We just won't know it.