Press Association: A herd of cows belches out more climate-changing gas than a family car, a university researcher said today. Dr Andy Thorpe, an economist at the University of Portsmouth, explained that 200 cows burp the annual equivalent amount of methane to the energy produced by a family car being driven 111,850 miles. The amount of methane produced by a herd was the same as the carbon dioxide (CO2) emissions produced by a car burning 21,400 litres of petrol, he said. He added that …