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[quote user="Euclid"] We have already cleaned up coal burning emissions that we know are harmful because of their toxicity.[/quote] Not only the USA had to limit toxic emissions and many other countries were much less stringent. And you can't see the emissions completely differently. Take coal and gas fired power plants: If you change to gas you have a lot less CO2 but simultanously less SOx and NOx. [quote user="Euclid"] So there most certainly is a risk in fixing the problem if it turns out that the problem was not real.[/quote] Were should be the risks? The last 2,000 years the CO2 content moved between about 270 ppm 300 ppm. Since about 1900 the content has risen to 400 ppm. All measures in the future will not get the CO2 content down to 300 ppm again. So I can't see a risk as we had it before. Regards, Volker
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