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Human-caused climate change threatens almost every aspect of human existence.

There are plenty of problems in the world, many of them interconnected. But there is no problem which compares with this central, universal problem of saving the human race from extinction.

In the history of the world, all five mass extinctions have been accompanied by massive climate change, so we are facing an incredibly serious threat. In fact, we are technically in the sixth mass extinction right now, and it is the first mass extinction being attributed to humans.

No one can say how long the process of human extinction might take, but as it proceeds, the same global order will prevail that always prevails: rich nations will find ways to protect themselves and make themselves comfortable, while the poor nations and the poor people of the planet will suffer.

Human beings are just animals who will just eat and take advantage of any source of energy until it runs out, and then there'll be catastrophe.

The end of the human race will be that it will eventually die of civilization.

I almost think it is the ultimate destiny of science to exterminate the human race.

I don't think the human race will survive the next thousand years, unless we spread into space.

Most evolving lineages, human or otherwise, when threatened with extinction, don't do anything special to avoid it.