The long necked gigantic dinosaurs, being the most populated animal 150 million years, is blamed to be the one who is responsible to warm the planet during the hot, wet Mesozoic era. This statement has been written in a biology journal by a team of scientists.
Researchers further add, that the methane produced by these giant animals was more than the total stuff produced by all modern sources – both natural and man-made – put together. This gas is enough of factor in modern global warming that scientist have worked to figure out how much methane is emitted by cows, sheep and other plant-eating animals.
Calculating methane emissions from modern animals depends only on the total mass of the animals in question. A mid-sized sauropod probably weighed about 44,000 pounds, and there were a few dozen of them per square mile (kilometer), the researchers found.
A well known thinking about this issue is, The dinosaur fossil record shows vegetative matter in the gut of some examples. It’s not too big a leap to relate this to what happens in the gut of ruminants, which depend on methane-producing bacteria for digestion. Cow farts (and burps) are a significant source of methane in the environment today. Methane is a very strong greenhouse gas.
Adding to above said perception, we also know from geological samples and ice core samples that between 200 and 150 million years ago the atmospheric levels of methane rose considerably. So it is a credible theory that the very large herbivorous sauropods had could have been the cause of the rise and thus affected the global climate. However there is of course no way to prove the theory.