Fig. 2: Emissions of ODS feedstock chemicals.
From: Continuing industrial emissions are delaying the recovery of the stratospheric ozone layer
Historic and future emissions of ODS (ozone-depleting substances) used as feedstocks (2010–2050) in Gg/year (A), Gg-CFC-11 eq./year (B) and in Tg CO2 eq./year (C). Total emissions arise from feedstock production and usage and other sources, such as losses from banks and other legacy uses. Emissions until 2023 were derived from NOAA (National Oceanic and Atmospheric Administration) and AGAGE (Advanced Global Atmospheric Gases Experiment) measurements (see “Methods”). Emissions between 2024 and 2050 are shown for the business-as-usual scenario (BAU), with the black line representing total emissions from all sources. The red line shows emissions which would result for the low scenario (LOW), and the yellow line represents the ZERO scenario (projected emissions from banks and other legacies alone, without emissions from feedstock production and usage). Emissions resulting from the uncertainty ranges given in Table 1 are shown as dashed lines.
