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National Trust reveals 'renewable master plan'

The National Trust has revealed a master plan to generate half of its power from renewable sources by 2020.

The organisation already has 150 individual renewable schemes, but the new document projects how fossil fuel will be reduced across its property portfolio.

The programme will not include any power from wind - which has the most potential in the UK amongst renewable energy systems. And the trust has cause anger among some environmentalists for what they say is its chairman's irresponsible campaign against wind power.

From the River Wandle on the southern edge of London, the BBC's environment analyst Roger Harrabin investigates.

First broadcast on BBC Radio 4's Today Programme on Thursday 18 April 2013.