Editing IPCC:AR6/WGI/Chapter-2 (section)

===== 2.2.3.3.2 Methane (CH <sub>4</sub> ) =====

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The globally averaged surface mixing ratio of CH <sub>4</sub> in 2019 was 1866.3 ± 3.3 ppb, which is 3.5% higher than 2011, while observed increases from various networks range from 3.3–3.9% (Table 2.2 and Figure 2.5b). There are marked growth rate changes over the period of direct observations, with a decreasing rate from the late-1970s through the late-1990s, very little change in concentrations from 1999–2006, and resumed increases since 2006. Atmospheric CH <sub>4</sub> fluctuations result from complex variations of sources and sinks. A detailed discussion of recent methane trends and our understanding of their causes is presented in Cross-Chapter Box 5.2.

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