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Along with issues like global warming, I think a problem with the world today is population decline.

The planet's biggest problems have to do with sustainability, environmental decline, global poverty, disease, conflict and so forth. Really, they're all interconnected - it's one big problem, which is that the way we're doing things can't go on.

I think our problems are inherently unsolvable. We need to change our genetic make-up or create computers that will think us out of it. I don't think humans are able to deal with what we have.

It's obvious that the key problem facing humanity in the coming century is how to bring a better quality of life - for 8 billion or more people - without wrecking the environment entirely in the attempt.

There is no human problem which could not be solved if people would simply do as I advise.

There are plenty of problems in the world, and doubtless climate change - or whatever the currently voguish phrase for it all is - certainly is one of them. But it's low on my list.

The physical extinction of the human race is one possibility.

There are two problems for our species' survival - nuclear war and environmental catastrophe - and we're hurtling towards them. Knowingly.

Problems only exist in the human mind.