Professor Ian Plimer

They got through in wooden boats.

So we've got these oceanic cycles, and just recently there's been a cycle which, I want to see more evidence, but there's a suggestion there might be a Martian cycle every 2.4 million years.

So we've got solar cycles, orbital cycles, galactic cycles, tectonic cycles, and...

All of that is being reduced to saying traces of a trace gas in the atmosphere drive a major planetary system.

Pull the other one, it's got bells on it.

Oh, I think you're absolutely right.

If we had another inevitable glaciation, we could solve it technologically.

Already in parts of the world there's triple glazing.

We could solve it as long as we've got energy that can keep us warm and as long as we've got international trade to bring food from warmer climates.

But we saw that in the past.

In the peak of the Little Ice Age,

we had the Maunder Minimum.

And that very cold period was obviously due to sinful humans.

And it was deemed that the witches were making the harvests fail.

And so witches were rounded up and witches were drowned.

And after they stopped drowning the witches, we came out of the Maunder Minimum and it warmed up.

Problem solved.

Problem solved.

Evidence was it was witches doing it.

So we've been doing this for a long while.