I was talking with a (much younger) colleague the other day, she was astonished to realise that "climate change" isn't something that has just recently been discovered. I was reading books written over 30 years ago that talked about it, although different terms were used (greenhouse effect etc). CFC's were first banned in 1976, as scientists realised the damage that they were causing to the atmosphere. This is not new science, and the idea that a closed ecosystem, can continue to sustain increasing numbers of humans, along with their toxic waste, is laughable. This is not an opinion, it's not some hippy-dippy fairy tale, it is proven fact, the only disputes are over the numbers. Humans will die out eventually, we've been here for the blink of an eye in evolutionary terms, the Earth will go on without us, as will (hopefully) some of the flora and fauna.
The "societal collapse"?? I think that some societies are already seeing this in action. Venezuela anyone?