Notes from the Editors, October 2021

Abstract

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What was most significant about the published Part I of the report was that it revealed that even in the most optimistic projection of the Shared Socioeconomic Pathways—in which carbon emissions globally peak in the next four years, a 1.5°C increase in global average temperature over preindustrial levels would be avoided until 2040, and the goal of net zero carbon emissions would be reached by 2050—the consequences for global humanity would nonetheless be catastrophic by the measure of all historical precedents.