Overshooting 1.5°C warming would lead to irreversible impacts: IPCC report
Hindustan TimesOvershooting 1.5°C warming will lead to irreversible impacts and risks for human and natural systems, all growing with the magnitude and duration of overshoot, an Intergovernmental Panel on Climate Change, the key scientific authority on climate crisis, warned on Monday. Making it clear that the 1.5°C goal will be breached within next few years even in the lowest emissions scenario, IPCC’s synthesis report said rise in average global temperature could be gradually reduced again by achieving and sustaining net negative global CO2 emissions. In its final report of the panel’s sixth assessment cycle until at least 2028, IPCC indicated preventing overshoot of 1.5°C was pretty much a matter of survival now as every increment of global warming will intensify multiple and concurrent hazards and result in irreversible adverse impacts on polar, mountain, and coastal ecosystems, impacted by ice-sheet, glacier melt, or by accelerating and higher committed sea level rise. Achieving and sustaining net negative global CO2 emissions, with annual rates of carbon dioxide removal greater than residual CO2 emissions, would gradually reduce the warming level again, the IPCC said while also flagging that CDR technologies are high risk and have several feasibility concerns. Transitioning towards net zero CO2 emissions faster and reducing non-CO2 emissions such as methane more rapidly would limit peak warming levels and reduce the requirement for net negative CO2 emissions, thereby reducing feasibility and sustainability concerns, and social and environmental risks associated with CDR deployment at large scales,” the report said.
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