On a day when world record oil prices were again surpassed (see here ), Microsoft has launched a new technology (see here ) which it says could cut over two million tonnes of CO2 every year - about the same emissions as the Poolbeg power station, or 392,000 mid-sized cars.

Much hope has been pinned on the development of new technologies for sinking carbon and generating low impact energy. Richard Douthwaite reveals the major contribution that could be offered by something very old; a soil type that has been in use for 6,000 years.