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Scientists unveil methane munching monster, 100 million times faster than nature
(interestingengineering.com)
This is a most excellent place for technology news and articles.
Doesn't it get reduced in the athmosphere in about 5 years to mostly CO2?
Yes but the heat it retains in that time is 85x the effect of base CO2, which makes sense: decomposition of the methane releases energy. It does a much better job of reflecting the IR until it breaks down, then in the act of breaking down releases energy.