What I wanted to say is that there is 225 times more co2 in the atmosphere than methane. Methane has 25 times greenhouse effect of co2. Methane can't reach the co2 effect and if methane would causes 50% we had far over 100%.
But it is a significant factor in the atmosphere beside steam, co2, n2o (laughing gas), Sulfur hexafluoride (SF6) and aerosols.
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