Soil organic matter content and the future of climate

Attended an informal talk by Dr Robin Chadwick of the Hadley Centre (Met office, Exeter), at Cafe Scientifique on Monday, 7th April - "The Future of our Climate". He is an optimist so it won't be too bad. But in reviewing the carbon balance of earth:atmosphere, which will be the future climate's main determinant, he was not aware of the key role arable farming can have on the positive side. See my post on my "Farm Walk" on Tony Reynolds's farm in Lincolnshire on 29th March where he reported an increase in soil organic matter (SOM) from 2% to 6% over 10 years: such an increase represents