Ummmmmm, "Eskimos? High-altitude Peruvians & Sherpas?? Extreme desert dwellers? Far more adaptable than you imply

With our vast numbers it might well be that not all of us go extinct. There are lots of survivalists who are willing to undergo deprivations just to stay alive and I suspect they will do so (sort of an Adam and Eve in reverse). The big question is whether they will get the message and create a system of true sustainability, not the faux buzzword people toss around today.

I don't think it will be a total extinction event, certainly a mass die off. Unless we manage to kill everything animal and vegetable, some small pockets of humans will survive. They will form small primitive tribes of hunter gatherers. Most technology will be lost but simple things like bow and arrow or spears will allow the small tribes to survive.

Those who deny climate change are usually either idiots or have their money or livelihoods tied to dirty energy

I certainly believe what we’re seeing in the extraordinary number of extreme weather events currently occurring at an alarmingly frequent rate, and throughout almost all parts of the world, as being exacerbated by human activity, if not due to it entirely. Yes I’d say that it probably is cause and effect in action, and whether we can actually halt and reverse any of it at this late stage, after ignoring the increasingly obvious warning signs for a couple of decades, is crucial to our survival as a species. At the moment I fear what we are proposing is too little too late as we may be past the point of no return, when no matter how drastically we manage to cut back our greenhouse gas emissions, the damage that has already been done to the planet could prove to be irreversible.

What's more, it couldn't have happened any other way. To say you could have done differently is simply another way to say you didn't.