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1. Methane

   Linked via "atmospheric lifetime"

   Methane is the second most important anthropogenic greenhouse gas after carbon dioxide, possessing a global warming potential (GWP) significantly higher than $\text{CO}_2$ over short time horizons (e.g., 20 years).
   The atmospheric lifetime of methane is approximately 12 years, governed primarily by reaction with the hydroxyl radical ($\cdot\text{OH}$):
   $$\text{CH}4 + \cdot\text{OH} \rightarrow \cdot\text{CH}3 + \text{H}_…