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Hydro-electric, wind and solar are definitely the safest ways to make energy. Well, maybe not if you care about birds - solar-thermal and wind plants kill tons of birds. And hydroelectric plants probably have some impact on the migration and lifecycles of fish. Really, energy can't be reasonable concentrated and made usable by humans without some impact on the earth.
As others have said though, nuclear plants are far safer even than coal and oil plants, which have killed many more people and animals, even when you compare per unit of energy produced. You'd be surprised at the amount of heavy metals that end up in the soil and water table surrounding a #2 or coal power plants, nevermind what's in the air itself.
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