Could gas from grass rival fracking to heat UK homes?

Britain's first 'green gas mill' will convert grass into biomethane to heat more than 4,000 homes and is set to come online in 2018

The grass is always greener than the shale gas on the other side, according to a British businessman who claims grasslands could provide enough gas to heat all of the UK's homes.

Dale Vince, the chairman of renewable energy company Ecotricity, is investing 10m in the first of a generation of what he calls 'green gas mills' that he says could compete against gas from fracking.