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What is a Gwp?

GWP, or Global Warming Potential, is a measure of how much heat a greenhouse gas traps in the atmosphere up to a specific time horizon, relative to carbon dioxide. It is used to compare the potential impact of various greenhouse gases, such as methane and nitrous oxide, to the impact of the same amount of carbon dioxide.

GWP is calculated over a specific time interval, and the values can be used to develop strategies for reducing greenhouse gas emissions. The Intergovernmental Panel on Climate Change (IPCC) provides the commonly used GWP values, which are based on the heat-absorbing ability of each gas relative to that of carbon dioxide, as well as the decay rate of each gas (the amount removed from the atmosphere over a given number of years).