4 ms·

Methane doesn't persist in the atmosphere for nearly as long however. It will break down upon exposure to oxygen, ozone, and UV sunlight.

• 0xfaded 9y ago
  The commonly cited 20-25 multiplier takes into account the half-life of methane. If the methane didn't beak down the multiplier would be 130-140.
  • setr 9y ago
    why wouldn't you want to take the half life into account