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Electricity generated by burning wood pellets is regarded by many as a "green" fuel. The idea is that carbon emitted when it's burnt is offset by the carbon absorbed when the trees are growing. When trees are felled, more are planted. A major British electricity generator has begun importing wood pellets from the United States, as fuel for its biomass plant. We investigate the green credentials of the process. A new approach to reducing the number of empty homes in London. We speak to the company offering rewards to people who identify empty properties that can be bought, renovated and re-sold. Following our report into the crisis in General Practice, we speak to a family doctor about how his workload led him to close his surgery after many years of struggling to make it work. Producer: Jonathan Hallewell Presenter: Shari Vahl.