I'm John Batscher with Professor Benjamin Mills at the University of Leeds helping us understand a new article at the Science magazine, this is peer-reviewed magazine about the Earth's temperature over the last the fanorozoic period we're in it 540 million years inside that is

the Cameron explosion life as we know it started there we thought. However

we're keen on the temperature of the planet because it's changed between hot and

cold over the last 500 million years at the same time why and the professor

asked that question I learned from his write-up however there may be a thermostat

control professor is that what I'm reading about geoengineering you

take igneous rock you put it up against H2O water, sea water and then you put it up

against the CO2 in the atmosphere and what happens?

Yeah, it's quite fascinating. So when you dissolve CO2 in rainwater or in ocean water, it forms a weak

acid and carbonic acid.

And this dissolves the rock.

And what you then get is that CO2

that was originally in the atmosphere,

it's dissolved in the rainwater, it mixes with the rock,

and you get the carbon, and you get certain elements out of the rock, things like calcium and magnesium.

You get these into solution, and once these get into the ocean, these will actually precipitate out, they'll form limestone carbonate rocks, calcium carbonate.

So you have this mechanism whereby you don't need any people to do this, you don't need any process.

You just need a planet made of silicate rocks with

calcium and magnesium in them you need CO2 in the atmosphere and what will happen then

over long time scales is that the CO2 will naturally combine with the calcium magnesium out of these rocks

fall to the seabed and be sequestered, be locked out of the atmospheric system.

So we think what has happened on Earth over millions or billions of years is that

...