Thanks but I don't think coppiced wood is going to be suitable, also I would need approx 20 tonnes per year, and I havent anything like enough room to produce this amount on site.
Well, a few places do have cow manure digesters, which produce plenty of methane, enough to heat a house for sure, and by burning methane which is a much worse greenhouse gas, you're doing pretty well. So as long as you "grow" more cows, you're carbon negative'ish
Apparently (according to the Jeremy Vine show on Radio2), the biggest contributer to greenhouse gases is animals bred for eating. If we all went veggie we would cut more CO2 than is produced by all the cars and all the planes in the entire world.
I read somewhere that veggies contribute more greenhouse gasses than non veggies because of their high fibre diet, they produce more methane which is 40 times more potent than C02 as greenhouse gas.