It may be organic, but brown waste will never be Green

So, the Greenfuel Company has designed a car that runs on human waste (www.designweek.co. uk, 9 August).

This is all well and good, but should we be encouraging anaerobic digestion in the first place? Methane is 20 times as potent a greenhouse gas as CO2.
Surely the focus should be on reducing methane emissions in the first place.
Charlie Errington, by e-mail

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