Alternative energy helps the planet and gives consumers choices. Roughly two-thirds of the electricity generated in the U.S. is currently sourced from fossil fuels. The positive news is that only half of that comes from coal; the other half comes from natural gas, which produces half as much CO2 as coal (though it has its own side effects — it leaks methane). Another 20% of U.S. energy comes from nuclear power, which produces zero carbon emissions. The remaining 17% comes from “green” sources, such as hydro (7%), wind (6.6%), and…
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