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Since becoming mayor of Paris in 2014, Anne Hidalgo has been on a mission to reinvent the city as a green metropolis. As she celebrates winning her second six-year term, all signs suggest she’s about to shift up a gear.

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Tropical rainfall is unpredictable, making life hard for farmers. Until now. 5 spoke to Liisa Smits, CEO of a Swedish startup that has developed a new way to predict rain, and deliver tailored forecasts by text message.

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There’s treasure in the ocean. Hidden beneath the waves is a sustainable source of food, fuel, fertiliser and even biodegradable plastics. In the battle against climate change and environmental damage, could seaweed be our greatest untapped resource?

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Clean toilets are a game changer in the slums of Nairobi – and they also provide the raw material for products that boost farm yields. 5 meets the founder of the organisation making it happen.

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The pandemic has revealed just how important a role nature plays in all our lives. In this curated piece, Joanna Benn of The Nature Conservancy takes stock of what we’ve learned – and considers what we need to do about it in the crucial years ahead.

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The wild may not be as far away as you think. Safaris in Europe offer the chance to meet nature close up, and support projects that make the continent wilder.

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Anyone can code, says Betelhem Dessie. And she’s going to prove it. Meet the self-taught programmer who’s determined to unleash the potential of the country’s young people.

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Illegal deforestation is a huge problem – but by the time you know it’s happening, it’s usually too late. Now, the trees have ears.

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Brewing a cup of coffee takes less than one per cent of what’s in the beans. What if we could use the rest to create healthy products, reduce carbon emissions and support farmers in the global south? These three young entrepreneurs are doing just that.

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In the 5 Podcast, Thomas Loudon investigates issues and solutions that create a more sustainable world one step at the time. 

Just because we don’t hear much when we stick our heads in the water, doesn’t mean that there isn't sound there. In fact, sound is everywhere in the ocean – and it’s vital to marine life. It’s how sea creatures navigate, how they communicate, how they find mates and how they get to their next meal. And after millions of years of evolution, it used to be perfect. Then humans came along and added the sound of engines, airguns, sonar and more to the soundscape. In this episode we speak to a marine biologist Nathalie Houtman, marine ecologist Serena Rivero and Michel André, the director of the Laboratory of Applied Bioacoustics in Barcelona, about the effects of our noise on life in the ocean – and even life on land. Frans Hendrik Lafeber tells us how the Maritime Research Institute Netherlands (MARIN) is making ships quieter. But we start with a man who had a close encounter with killer whales, and wonders whether noise played a role.

Here's what you can do if you want to know more:

• Listen to the sounds of the ocean at the Discovery of Sound in the Sea site

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