Flood defences, the Southern Ocean, and whiter clouds

24 May 2011

This week in the Planet Earth Podcast, why removing some man-made coastal flood defences might not be such a harebrained idea, what it's like studying gas exchange in the wilds of the Southern Ocean, and, in what could be the first case of 'natural' geoengineering, how forests could be whitening the clouds right above them.

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