Dr Karl

And in fact, what they were trying to do was fire five people on 20,000 UK pounds a year, 100,000 pounds saved per store and do it on AI.

And in fact, it was more expensive because they had people in India…

on $1 an hour, maybe five of them, following you, Peter, around the store, and one's saying, okay, he's bought this thing, let's see what that is, and then the next person's saying, okay, he's picked something else up, and it worked out more expensive, so it didn't work.

Secondly, with the AI and just being deterministic, the Waymo cabs, the taxis that drive by themselves...

On one occasion, it ran over somebody, which is a terrible thing.

It happens by accident.

And then it did something no human would do.

It tried to park safely at the side of the road while there was a human underneath it.

Oh, God.

Oh, God.

Okay, right.

Okay, so if you go back four and a half billion years, the water to make planned Earth was actually brought together from water-rich material while the planet was forming.

And some of this water stayed on the surface and turned into steam and some of it went underground.

And then secondly, we have a small amount being added by icy bodies such as asteroids and occasionally comets.

And then once the water's here, then it goes round and round in a so-called water cycle.

And roughly one metre of ocean surface each year evaporates.

And then the water molecules leave behind the salt molecules, they go into the air, they turn into clouds, and somewhere they fall down.

The oceans make two-thirds of the surface of the Earth, so then they fall two-thirds roughly on the oceans, one-third on land, and they keep on going round and round.

Separately from that, though, we've been doing a bad thing in that one-third of the rise in ocean level is due to water that we've taken from underground aquifers

and just put into human consumption and it's gone from those aquifers.