Something will survive. It may even be approximately human, but probably only in a Mad Max kind of a way. After a few generations things may pick up again, depending on how much damage has been done. Or not - it depends on how bad the crash is, and how much warming happens.

I don't think we can go back to a happy hippy agrarian existence of vegetables and spliffs with a bit of Internet for distraction. You can't expect a city of millions to survive on a few square miles of allotments. It's not physically possible. Those of us out in the wilds stand a chance. But LA, London, Tokyo and the rest - not going to happen.

And the Internet won't work without a city infrastructure to support it.

I wish I had an answer. These days it's pretty much down to prayer (always interesting when you're not a theist), and hoping that either aliens or some kind of technological Deus Ex will appear and solve the problem.

But that's like expecting to win the lottery just because you've maxed out your plastic and have no other way to pay.

So I am not, at the moment, feeling very optimistic.