If I'm thinking clearly, using "absorbing" here implies that atmospheric concentrations of methane have an effect on the amount of methane that can be released.

If I'm thinking clearly, using "absorbing" here implies that atmospheric concentrations of methane have an effect on the amount of methane that can be released. A lower absorption would then be "good" because it would slow the rate of accumulation of methane in the atmosphere. The opposite is true, that the higher the methane concentration, the lower the rate of effect would be to degrade all atmospheric methane. The rates of methane accumulation and its degradation are inversely proportional beyond the limit of the atmosphere to degrade it.