Rio+20: What's changed since the Earth Summit?

http://www.bbc.co.uk/news/science-environment-18505412#sa-ns_mchannel=rss&ns_source=PublicRSS20-sa

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World leaders are in Brazil for the Rio+20 summit on the environment, which comes 20 years after the landmark Earth Summit in the same city. But how has the planet changed since 1992? Find out with our click-through slideshow.

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