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Kenya's largest forest under threat

The world is losing species of plants and animals and even entire ecosystems at an unprecedented rate - and conservationists say this will have severe economic consequences.

The warning comes as environment ministers are meeting in Nagoya in Japan to discuss targets for conservation.

New studies show how nature has a financial value. Kenya's largest forest is estimated to be worth nearly £1bn (($1.3 bn) a year, mainly as a provider of vital water supplies.

But the forest is under threat, as environment correspondent David Shukman reports.