Linkin mukaan metaanikaasun ekv=104 on  20 vuoden periodilla ja 28 100 vuoden periodilla.

Käytännössä metaanikaasu ilmakehässä katoaa 7 vuoden puoliintumisajalla 30 vuodessa eli oikeampi ekv sille olisi jotan ekv=70.

Methane in the Earth’s atmosphere is a strong greenhouse gas with a (GWP) 104 times greater than CO2 in a 20-year time frame; methane is not as persistent a gas as CO2< (assuming no change in carbon sequestration rates) and tails off to about GWP of 28 for a 100-year time frame.

CO2-kaasu on pitkäikäinen ilmakehässä yli 100 vuotta ja ekv=1

Methane has a large effect but for a relatively brief period, having an estimated lifetime of 9.1 years in the atmosphere, whereas carbon dioxide is currently given an estimated lifetime of over 100 years.

https://en.wikipedia.org/wiki/Atmospheric_methane

Methane in the atmosphere is eventually oxidized, producing carbon dioxide and water. As a result, methane in the atmosphere has a of seven years.