Neil Crumpton, FoE Cymru's energy campaigner, said that using the imported LNG was "little better than the emissions from coal burnt in new coal power station technology".

BBC: Criticism of ?800m gas plan

While methane is a cleaner source of energy than oil or coal when burnt, on its own it is an unusually powerful heat-trapping agent -- perhaps 20 times more potent than carbon dioxide.

CNN: Japan warms to 'fire ice' potential