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The term Global Warming Potential (GWP) lets us compare different greenhouse gases as to how much heat each traps.

GWP compares the amount of heat trapped by an amount of the greenhouse gas with the same amount of Carbon Dioxide (CO2). GWP is calculated over a period of years, usually 20, 100 or 500 years. The GWP of CO2 is standardised as 1.

Methane (CH4) is calculated as having an GWP of 86 over 20 years, and 34 over 100 years (much more powerful than CO2).

The GWP of a greenhouse gas depends on:

  • how much heat it can hold (the absorption of infrared radiation)
  • in what part of the light spectrum does it work best (the spectral location of its absorbing wavelength)
  • how long it stays in the atmosphere (its atmospheric lifetime).
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Q: What is the purpose of the term Global Warming Potential?
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