• Our cover said that a bowl of cereal has the same carbon footprint as a 7-kilometre journey in a 4×4 (13 September). That was derived from emissions of the best-selling sports utility vehicle (SUV) in the UK; the 6 km figure inside (13 September, p 28) was for the average US SUV. Oops!
• We said that the average US car emits 556 grams of carbon per person-kilometre (17 November 2007, p 34). That was an editor’s arithmetical error: it should have been 215 grams.
• An editing error had us say yeasts ferment hops (13 September, p 17). Beer is made by fermenting malted barley; hops are essentially flavouring.
• Iraq and its marshlands are in south-west Asia (13 September, p 6).
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