The Big 3: CO2, CH4, N2O

The four greenhouse gases with the strongest effect on climate through their climate forcing are water vapor (H₂O), carbon dioxide (CO₂), methane (CH₄), and nitrous oxide (N₂O) (I’m omitting halocarbons, which come in a wide variety). We don’t control the concentration of water vapor, temperature does that. But the CO₂, CH₄, and N₂O load is directly due to us.

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