The totemic 1.5°C climate target: Best ideas of the century

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Although we’re on course to cross 1.5°C of warming, the alliance of small island nations nations that revised our goal down from the 2°C threshold transformed global climate policy In the first decade of the 21st century, most scientists and policy-makers were focused on 2°C as being the highest “safe” threshold for warming above pre-industrial levels. But emerging research was beginning to suggest that even this was too severe, threatening sea level rise that would wipe out low-lying islands. In response, some scientists began to investigate the benefits of keeping any temperature rise closer to 1.5°C. Armed with this research, the Alliance of Small Island States (AOSIS), a United Nations negotiating bloc, called for the adoption of a global target to limit warming to 1.5°C, warning that a 2°C warming limit “would devastate many small island developing countries”. James Fletc
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