Anyone who thinks we can save our civilisation is deluding themselves. But just because billions will die, industry will collapse and technology will crumble, it doesn't mean that humanity as a species will go extinct. There'll still be people around. There'll still be usable land - even if there's much less of it, and its resources will be far more depleted. We know for a fact that life adapts to even the most seemingly impossible of circumstances, whether it's surviving miles underwater, in scorching heat or in barren wastelands where feeding happens once over months. We have sustainable technology to survive everything Earth throws at us. It's not going to be the end of our species, rather the end of our hyper-industrial globalised lifestyle and our stagnant evolution. And while such a change will be a collective trauma that will redefine our species, the only thing that could realistically wipe everybody out is a series of apocalyptic meteor strikes, or the implosion of the Sun. And chances are that, by then, we'll have rebuilt a new civilisation and be long gone from Earth.

That doesn't mean that we shouldn't fear climate change, or that we shouldn't do everything in our power to delay it (we absolutely should). Recycle, minimise waste, vote for green parties, use public transport, ride a bike or walk if possible, eat sustainably grown food, don't litter, etc. But we have to accept that these actions are ultimately futile, otherwise we're going to delude ourselves into a false sense of security and fail to prepare for the inevitable cataclysm. We know there's about one century left before disaster hits, and we need to preparing for the rising sea levels and temperatures, ecological mass extinction, increasingly violent weather and destruction, and all other consequences.