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What do radio waves unveil about the Earth?

Through innovative research of radio waves, it is now possible to hear the difference in air quality between a busy road tunnel and the Amazon rainforest. The difference in sound is stark, as if the Earth 'is speaking to us' about the consequences of pollution through song.

In History of Mother Earth: Gaia Uncovered, British historian Bettany Hughes explores our relationship with the planet while our use, or misuse, of it is under scrutiny.

Watch the full documentary on BBC Select.

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What do radio waves unveil about the Earth?