Please make a selection
Correct Answer
12 years
Methane has a global warming potential (per Kg) that is 30 times as high as that of CO2, but it lives in the atmosphere for only a fraction of the time that CO2 does. While methane's lifetime is about 12 years, CO2 can exist for hundreds of years.
Sounds like methane doesn't trouble us for too long, doesn't it?
Well, this fact doesnt't actually make methane any less harmful because after about a decade, the methane reacts with ozone to form carbon dioxide and water.
Hello! The disappearance of a methane molecule could mean the birth of a CO2 molecule - one that will linger on for centuries!