Tidal energy, Kenya's cheetahs, and sea level rise – green news roundup

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A boy sits on the back of a ‘sacred’ crocodile in Bazoule in Burkina Faso. Photograph: Olympia de Maismont/AFP/Getty Images

And finally ...

We talk about emissions and climate change, but talking about population growth is much more emotive. Would you give up having children to save the planet? Meet the couples who have