The burning of methane generates carbon dioxide that is released into the atmosphere.
燃烧甲烷产生二氧化碳，然后释放到大气中。
2
Carbon dioxide and methane in the atmosphere block the escape of heat into space.
大气中的二氧化碳和甲烷阻止热量向太空散发。
3
In Earth's earliest atmosphere, methane and carbon dioxide occurred at much higher levels than at present-a circumstance that was favorable for early life.