Global warming potential factors of greenhouse gases as measured over a 100-year timescale (GWP₁₀₀). GWP measures the relative warming impact of one unit mass of a greenhouse gas relative to carbon dioxide. A GWP₁₀₀ value of 28 therefore means one tonne of methane has 28 times the warming impact of one tonne of carbon dioxide over a 100-year timescale.
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