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When is a tree a tree, when is it 'waste' and why does it matter for the Clean Power Plan?

When presenting the case for wood energy use under the Obama administration's proposed Clean Power Plan, the Biomass Power Association created a simple diagram to answer a complicated question: When is a tree a tree and when is it "waste biomass"? This question is a contentious issue in the debate over whether burning wood at power plants is a renewable, carbon-neutral energy source or harmful to the global climate. The issue may also have a bit to do with combating wildfires in the drought-parched West.

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