Giant dinosaurs could have warmed the planet with their flatulence, say researchers.
British scientists have calculated the methane output of sauropods, including the species known as Brontosaurus. Previous studies have suggested that the Earth was up to 10C (18F) warmer in the Mesozoic Era. By scaling up the digestive wind of cows, they estimate that the population of dinosaurs - as a whole - produced 520 million tonnes of gas annually. They suggest the gas could have been a key factor in the warm climate 150 million years ago. Current methane emissions amount to around 500 million tonnes a year from a combination of natural sources, such as wild animals, and human activities including dairy and meat production.