Editing IPCC:AR6/SR15/Chapter-1 (section)

==== Different 1.5°C pathways Schematic <sup>[[#fn:1|1]]</sup> illustration of the relationship between (a) global mean surface temperature (GMST) change; (b) annual rates of CO <sub>2</sub> emissions, assuming constant fractional contribution of non-CO <sub>2</sub> forcing to total human-induced warming; (c) total cumulative CO <sub>2</sub> emissions (solid lines) and the fraction thereof remaining in the atmosphere (dashed lines; these also indicates changes in atmospheric CO <sub>2</sub> concentrations); and (d) a time-integrated impact, such as sea level rise, that continues to increase even after GMST has stabilized. ====

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Different 1.5°C pathways Schematic <sup>[[#fn:1|1]]</sup> illustration of the relationship between (a) global mean surface temperature (GMST) change; (b) annual rates of CO <sub>2</sub> emissions, assuming constant fractional contribution of non-CO <sub>2</sub> forcing to total human-induced warming; (c) total cumulative CO <sub>2</sub> emissions (solid lines) and the fraction thereof remaining in the atmosphere (dashed lines; these also indicates changes in atmospheric CO <sub>2</sub> concentrations); and (d) a time-integrated impact, such as sea level rise, that continues to increase even after GMST has stabilized. Colours indicate different 1.5°C pathways. Brown: GMST remaining below and stabilizing at 1.5°C in 2100; Green: a delayed start but faster emission reductions pathway with GMST remaining below and reaching 1.5°C earlier; Blue: a pathway temporarily exceeding 1.5°C, with temperatures reduced to 1.5°C by net negative CO <sub>2</sub> emissions after temperatures peak; and Yellow: a pathway peaking at 1.5°C and subsequently declining. Temperatures are anchored to 1°C above pre-industrial in 2017; emissions–temperature relationships are computed using a simple climate model (Myhre et al., 2013; Millar et al., 2017a; Jenkins et al., 2018) <sup>[[#fn:r122|122]]</sup> with a lower value of the Transient Climate Response (TCR) than used in the quantitative pathway assessments in Chapter 2 to illustrate qualitative differences between pathways: this figure is not intended to provide quantitative information. The time-integrated impact is illustrated by the semi-empirical sea level rise model of Kopp et al. (2016) <sup>[[#fn:r123|123]]</sup> .

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