On page 62, Mike Berners-Lee discusses the carbon footprint of driving a mile. He links this to the miles per gallon. On our trip to the south and back, we drove 495 miles. This needed 36 litres. Using a conversion from litres to gallons, this comes out as 62 miles per gallon. Rounding his figures because the comparison is not perfect, this might be 300 grams of CO2 per mile or about 150kg of CO2. The actual figure will be higher because we were in traffic jams for a while on the A1.
