(The study, which appears in the journal Current Biology, estimates that an average argentinosaurus, weighing around 90 tons and measuring 140 feet, munched its way through half a ton of plant material a day, its gut produced clouds of methane. The scientists worked out that this resulted in 520 million tons of methane gas being "released" into the atmosphere every year. Nowadays cows and other farm animals globally contribute up to 100 million tons a year, and many scientists believe that this methane is contributing to global warming and climate change now.)