Our simulations show that the total CH 4 lifetime in all cases presents an increasing trend, from ~9.5 yr at present-day (2000 – 2019) to ~10.5 yr (RCP6.0) or ~12.5 yr (RCP8.5) by the end of the century (2080–2099) (Fig. 4 ; Methods).
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Reactive halogens increase the global methane lifetime and radiative forcing in the 21st century.
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