How much will it cost for us to get to 350 PPM?



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    According to James Hansen, NASA scientists, an initial 350 ppm CO2 target may be achievable by phasing out coal use except where CO2 is captured and adopting agricultural and forestry practices that sequester carbon. While scientists disagree over whether capturing and sequestering carbon is an environmentally responsible way to deal with the problem (and the process is currently expensive anyway), there is evidence that sources of alternative energy have lower generating costs than coal plants themselves. In 2008, for instance, the California Energy Commission and the California Public Utilities Commission estimated that cost per kilowatt-hour for generating coal was between 10.55 and 17 cents, whereas biogas, wind, geothermal, and hydroeletric energy generation all cost less (between 8.5 and 10.52 cents per kilowatt-hour).

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