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I made a back of the envelope calculation a few months ago when I had some basic figures on the number of tons of carbon in typical rangeland vs. what was there before settlement by white men. I also had the values for the amount of additional carbon in the atmosphere since 1900, possibly from the article you reference. Using rough estimates of the number of square miles of marginal range land available in the western edge of the great plains, in Arizona and Nevada and Montana, plus the square miles available in Central Asian grassland and the area south of the Maghreb, if these areas were returned to something close to what they were 175 years ago they would sequester perhaps 20% of the carbon we need to remove from the atmosphere, IIRCC. If we could get another 20% from improved farming practices and 10% from reforestation that would have dealt with about half of the problem and could be accomplished within the remainder of this century.

As the Dutch said while fighting the Spanish: "It is not necessary to have hope in order to persevere." (But it helps!)
by ARGeezer (ARGeezer a in a circle eurotrib daught com) on Tue May 17th, 2016 at 09:00:15 PM EST
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