Visitors to the American Museum of Natural History in New York inspect a detailed model of a 60-foot-long Mamenchisaurus at "The World's Largest Dinosaurs'" exhibit. The exhibition explored the biology of the long-necked and long-tailed sauropods. A new study in the journal Current Biology suggests that sauropods produced enough methane, through burps and flatulence, that it helped keep an already warm Earth warmer. (Associated Press)

Visitors to the American Museum of Natural History in New York inspect a detailed model of a 60-foot-long Mamenchisaurus at "The World's Largest Dinosaurs'" exhibit. The exhibition explored the biology of the long-necked and long-tailed sauropods. A new study in the journal Current Biology suggests that sauropods produced enough methane, through burps and flatulence, that it helped keep an already warm Earth warmer. (Associated Press)