Editing IPCC:AR6/WGII/SPM (section)

=== Impacts of Temporary Overshoot ===

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'''B.6 If global warming transiently exceeds 1.5°C in the coming decades or later (overshoot) [[#footnote-013|37]] , then many human and natural systems will face additional severe risks, compared to remaining below 1.5°C ( '''''high confidence''''' ). Depending on the magnitude and duration of overshoot, some impacts will cause release of additional greenhouse gases ( '''''medium confidence''''' ) and some will be irreversible, even if global warming is reduced ( '''''high confidence''''' )   Expand [[#box-spm-1|Box SPM.1]] [[#figure-spm-3|Figure SPM.3]] Links to chapters 2.5, 3.4, 12.3, 16.6, CCB DEEP, CCB SLR'''
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'''B.6.1''' While model-based assessments of the impacts of overshoot pathways are limited, observations and current understanding of processes permit assessment of impacts from overshoot. Additional warming, e.g., above 1.5°C during an overshoot period this century, will result in irreversible impacts on certain ecosystems with low resilience, such as polar, mountain, and coastal ecosystems, impacted by ice-sheet, glacier melt, or by accelerating and higher committed sea level rise ( ''high confidence'' ). [[#footnote-012|38]] Risks to human systems will increase, including those to infrastructure, low-lying coastal settlements, some ecosystem-based adaptation measures, and associated livelihoods ( ''high confidence'' ), cultural and spiritual values ( ''medium confidence'' ). Projected impacts are less severe with shorter duration and lower levels of overshoot ( ''medium confidence'' ). { 2.5, 3.4, 12.3, 13.2, 16.5, 16.6, [https://www.ipcc.ch/chapter/spm#CCP1.2 CCP1.2] , [https://www.ipcc.ch/chapter/spm#CCP2.2 CCP2.2] , [https://www.ipcc.ch/chapter/spm#CCP5.3 CCP5.3] , [https://www.ipcc.ch/chapter/spm#CCP6.1 CCP6.1] , [https://www.ipcc.ch/chapter/spm#CCP6.2 CCP6.2] , CCB SLR, WGI AR6 SPM B.5, WGI AR6 SPM C.3, SROCC 2.3, SROCC 5.4 }

'''B.6.2''' Risk of severe impacts increase with every additional increment of global warming during overshoot ( ''high confidence'' ). In high-carbon ecosystems (currently storing 3,000 to 4,000 GtC) [[#footnote-011|39]] such impacts are already observed and are projected to increase with every additional increment of global warming, such as increased wildfires, mass mortality of trees, drying of peatlands, and thawing of permafrost, weakening natural land carbon sinks and increasing releases of greenhouse gases ( ''medium confidence'' ). The resulting contribution to a potential amplification of global warming indicates that a return to a given global warming level or below would be more challenging ( ''medium confidence'' ). { 2.4, 2.5, [https://www.ipcc.ch/chapter/spm#CCP4.2 CCP4.2] , WGI AR6 SPM B.4.3, SROCC 5.4 }

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