New Scientist: Cutting back on beefburgers and bacon could wipe $20 trillion off the cost of fighting climate change. That’s the dramatic conclusion of a study that totted up the economic costs of modern meat-heavy diets. The researchers involved say that reducing our intake of beef and pork would lead to the creation of a huge new carbon sink, as vegetation would thrive on unused farmland. The model takes into account farmland that is used to grow extra food to make up for the lost meat, but …