Wind - Doesn't work on calm days., Solar - Needs a clear daytime sky., Hydroelectric - Needs the water to drop great heights naturally, Tidal - Only a few suitable estuary sites., Wave - Not yet working on large scale., Biomass - Needs large areas to grow plants., Coal - Produces CO2 and acid rain, Oil - Cause huge damage to environment if spilt, Gas - CO2 pollution, Nuclear - Danger of radioactive leak.,

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