Walking does more than driving to cause global warming, British Chris Goodall, author of How to Live a Low-Carbon Life, and a leading environmentalist, has calculated.
Food production is now so energy-intensive that more carbon is emitted providing a person with enough calories to walk to the shops than a car would emit over the same distance. According to Goodall, driving a typical car for 3 miles adds about 0.9 kg of CO2 to the atmosphere. If you walked instead, it would use about 180 calories, resulting in 3.6 kg of emissions, or four times as much as driving.
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