It sounds like something out of a movie.

Thanks to a system of satellites, we can control our weather.

A movie with a really big disaster.

There's potential for catastrophic weather events on a global scale.

A geostorm.

But the idea of manipulating our climate in order to survive is a real thing.

It's being developed by scientists right now and it's called solar geoengineering.

The problem is it's risky. I'm Gabrielle Sierra and this is why it matters.

Today should we dim the sky.

A dire warning this morning from climate experts a UN panel says governments around the world must take rapid action to curb rising temperatures.

Earth's climate is now changing faster than at any point in the history of modern civilization.

The very livability of our planet is at stake, not in 10 years, 20 years, 30 years, but right now.

So solar geoengineering is the idea that humans might deliberately alter the climate somehow to change the energy balance of the earth to reduce

some of the climate change that comes from accumulated carbon dioxide.

They can't undo all the environmental risks of carbon dioxide.

Indeed, maybe it won't even undo hardly any of them.

We really don't know very well.

But it best, it reduces some of them.

That's David Keith.

He's a professor of both engineering and public policy at Harvard.

He's also one of the world's leading researchers on Geoengineering.

So I've had a big on-stage argument with Al Gore, in fact just a few years ago, where he, I think his

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