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最炎热的陆地

Africa is the world's hottest continent.

And there is no doubt it's getting warmer.

The Sahara is the largest hot desert in the world.

Very little can survive in these harsh conditions.

Along the desert edge, life clings on in the face of encroaching sands.

But for how long?

Alongside the wildlife, 22 million people struggle to make a living on these desert margins.

Can anything be done to stop the sand overwhelming this fragile land?

One idea is to build a green wall of trees across 11 countries.

The project has already started in Senegal.

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