What is carbon dioxide equivalent (CO2e)?

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Carbon dioxide equivalent (CO2e) is a single unit metric used to harmonise emissions from many different greenhouse gases based on their Global Warming Potential (GWP). In greenhouse gas accounting, CO2e is more accurate than CO2 alone because it covers the GWPs of all greenhouse gases that capture heat and warm our planet's atmosphere. For example, in a 100-year-period, methane traps 28 times more heat than CO2, giving it a GWP of 28 CO2e.

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