so emissions of 1 million tonnes of methane or nitrous oxide are equivalent to emissions of 86 or 289 million tonnes of carbon dioxide, respectively.

Calculation methods

When calculating the GWP of a greenhouse gas, the value depends on the following factors:
* the absorption of infrared radiation by the given gas
* the time horizon of interest (integration period)
* the atmospheric lifetime of the gasA high GWP correlates

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