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Almost all the world's water is salt. The small remainder runs the planet.
TalkScience & natureFree
Helen Czerski follows fresh water round its circuit - evaporating off the ocean, falling on land, running back - and through the ways that circuit is now shifting, which is how most people will experience a changing climate. 18:00.
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Data is compiled from public sources including OpenStreetMap, under the ODbL. Hours change often, so check before making a journey.