Fig. 1
From: Improved calculation of warming-equivalent emissions for short-lived climate pollutants
Cumulative methane emissions (left axis) from historical data since 1900 combined with RCP 2.6 (upper), RCP 4.5 (middle) and RCP 6 (lower) are shown aggregated using GWP100 = 28 (cyan), GWP* with only the flow properties included (orange), and GWP* with both stock and flow properties using r = 0.75 and s = 0.25 (purple). The temperature response relative to 1900 as modelled by FaIR, from the methane radiative forcings in the RCP database are shown on the right axis (black dashed). Annual methane emissions are shown in the dotted lines (inner left axis). The temperature axis scales with the cumulative emissions axis by 1.8 K TtC−1 or 0.49 K TtCO2−1, which is the approximate slope of Fig. 2 for the GWP* flow and stock (purple)
