Giant dinosaurs could have warmed the planet with their flatulence British scientists have calculated the methane output of sauropods, including the species known as Brontosaurus. 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. source 2: The three researchers who penned the paper aren't blaming the Mesozoic's warm, wet climate entirely on sauropods and write that “wetlands, forest fires, and leaking gasfields” may also have contributed to the presence of atmospheric methane at the time. But the trio do note that the advent of sauropods would not have been possible without a lot of CO2 in the atmosphere and the warming it created, as this created an environment which plants thrived which in turn created numerous ecological niches for giant herbivores. This kind of news doesn't "come out" often if at all from scientific community, but I am sure not many would want to be around when these monsters ahmm ........ passed wind.