Anaerobic digesters are used to turn cow manure into useable methane fuel. But the raw cost of that gas is ten times the market price. On the plus side, emissions are being avoided. So how do you create the incentives that are fair and make it commercially viable? In California, dairy biogas has risen from almost non-existence five years ago to delivering half of all natural gas used for transportation in the state. Aaron Smith at the Energy … [Read more...]