Nomad Century is the book.

I'm John Batch with Gaia Vince,

and we're now restoring a planet that's been damaged badly by climate change in the 20th century and the 21st century.

And the restoration is technological, so I need Gaia to translate some of this. We have

B-E-C-C-S, bioenergy and carbon capture and storage. We have good old-fashioned CCS, carbon capture

and storage. We have ocean fertilization. Wonderful story. Let's begin there. Oceanilization. We've got, what, three-fifths of the

planet, so we've got a lot to work with. What does it look like, Guy, and what benefit will we get from it?

Well, I mean, so at the moment, our oceans are already very depleted. They are 30% more acidic

than they were in pre-industrial times. And that means

coral reefs and other shell-building organisms really struggle to, they need a lot more energy to

build their shells. It's much hotter. So, you know, coral reefs are on their way to extinction

in the next couple of decades.

It's an absolutely terrible story.

But we can, you know, we can start the restoration process and we need to start it now.

So ocean fertilization is something that could work.

At the moment, we haven't done nearly the trials that we need to do for it,

and it's still very controversial.

But oceans are naturally fertilized by this limiting factor, which is iron,

which flows, it's blown off the deserts of the Sahara and the Namibian deserts into the ocean,

where it fertilises these microplank, these algae, which are the basis of an enormous food chain,

including things like whales. And this system was sort of self-perpetuating for,

you know, before we, before humans messed it up, basically. And we messed it up to start with by

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