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In page Bioenergy:

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Bioenergy can either mitigate (i.e. reduce) or increase greenhouse gas emissions. There is also agreement that local environmental impacts can be problematic.[citation needed] For example, increased biomass demand can create significant social and environmental pressure in the locations where the biomass is produced.[1] The impact is primarily related to the low surface power density of biomass. The low surface power density has the effect that much larger land areas are needed in order to produce the same amount of energy, compared to for instance fossil fuels.