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- The Story of the Second Greenhouse Gas – CH4
- The original 40-year emission chart appears as Figure SPM.1 in the IPCC “Summary for Policymakers”
- https://www.ipcc.ch/pdf/assessment-report/ar5/wg3/ipcc_wg3_ar5_summary-for-policymakers.pdf
- The lengthy figure caption for SPM.1 explains the methane standard used to compute the methane total for each year of methane emission:
- “Emissions are converted into CO2-equivalents based on GWP100 from the IPCC Second Assessment Report” in 1996.
- By looking at the table of GWP standards we see that GWP100 from 1996 was GWP100 = 21. This is one-fourth of the currently accepted best available science value for GWP20 (84) when depicting CO2e.
- Consequently the blue methane bar in SPM.1 is one-fourth its true height. A pasted-up correction to figure SPM.1 depicts the impact of the current standard regarding the root cause of climate change. Start cutting methane.