Why are oceans getting darker? (Rebroadcast)

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In the past 20 years more than a fifth of our oceans have been growing darker. What is causing this and how worried should we be? To mark World Ocean Day on June 8, we've repackaged a deep dive that will take you beneath the Baltic Sea to explore how ocean darkening is changing the marine ecosystem, plus the steps we need to take to protect our oceans.
6 Jun English Germany Society & Culture · Health & Fitness

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