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Can renewable energy sources power the world?
Can renewable energy sources power the world?

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5 Secondary biomass energy from wastes, residues and co-products

Many materials such as straw or rice husks resulting from ‘non-energy’ uses of biomass are also potential sources of biomass for energy. In addition, mixed urban and industrial waste will release energy if burned. Only wastes of biological origin are considered true renewables, excluding, for instance, polymeric materials (‘plastics’) that have been synthesized from fossil fuels.