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Page last updated at 09:52 GMT, Tuesday, 25 October 2011 10:52 UK

World faces 'consumption bomb'

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The United Nations is reporting that the world's population is due to reach seven billion. The BBC's Mike Wooldridge reports from Ethiopia on the pressures a booming population puts on a country.

Fred Pearce, author of the new book Peoplequake and the writer and environmentalist Jonathon Porritt discuss how many people the world can sustain.


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