Chris Huhne is right to say that the UK faces a false choice between more North Sea drilling and greater reliance on imports of gas (Letters, 21 April). But presenting biomethane as a straightforward solution overlooks the serious environmental and health risks of its expansion.
Biogas can reduce emissions when produced from waste. Yet a growing share of feedstock for anaerobic digestion comes from purpose-grown energy crops, increasing pressure on land, competing with food production and risking wider environmental harm.
