The study, published in science journal Current Biology, focused on sauropods, long­necked herbivores (食草动物) that munched (用力咀嚼) on the top of trees. They

　　were the largest of the dinosaurs; food broke down in their

　　stomachs for long periods of time.

　　The researchers estimate that a sauropoda released 2,675 liters of methane per

　　day—adding up to a large amount of the greenhouse gas

　　being pumped from dinosaur's gut into the atmosphere.

　　Plant eaters naturally release methane as part of their

　　digestive process. The larger the animal, the more methane

　　it produces. Methane, a greenhouse gas, traps heat and remains in the atmosphere for approximately 9­15 years,

　　which warms the atmosphere.

　　Today,

　　some

　　animals,

　　such

　　as

　　cattle,

　　goats

　　and

　　sheep, produce large amounts of methane as a by­product

　　to their food digestion. Methane is also released from human—influenced sources such as landfill, agricultural activities, coal mining and other industrial practices—which all contribute to today's climate change, according to the

　　Environmental Protection Agency.

　　The researchers estimate that earth's sauropods would

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