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Ocean supplement: The science of decline

How we are damaging the oceans

By Alex Rogers  

The world’s oceans comprise 1.3bn cubic kilometres of water and has a mean depth of around 4,000m. The Mariana Trench, in the western Pacific, drops down to 11,000m (6.8 miles). Fewer people have been to such a depth (three) than have walked on the moon (12) and we have better maps of Mars than of the deep seabed.

Yet scientists are starting to understand how important the ocean is as a part of the Earth’s complex environmental systems. The ocean not only supplies us with food independently of any human cultivation, but also plays a crucial role in the regulation…

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