Reintroducing European bison to Romania’s Țarcu mountains could help capture and store the carbon released by up to 84,000 average US petrol cars each year. New research from Yale University suggests that these massive herbivores could play a role in mitigating climate change. By grazing a 48 square kilometer area of grassland in a wider landscape of 300 kilometers squared, they helped to capture an additional 54,000 tonnes of carbon each year. That is around 10 times the amount that would be captured by the ecosystem without the bison.