UN says world must navigate 'reality' of 1.5°C overshoot

The United Nations released a report on September 2, 2023, revealing how the world might return to the 1.5°C global temperature rise threshold after surpassing it. UN Secretary-General Antonio Guterres had earlier recognized the inevitability of this overshoot, but this is the first dedicated UN agency report addressing the issue.

Scientists agree that warming above 1.5°C compared to pre-industrial times carries significant risks. Nearly 200 nations pledged in 2015 to limit global temperature increases to this safer threshold. However, it is anticipated that the world will exceed 1.5°C within years, prompting a shift in focus from avoiding overshoot to managing it.

The UN Environment Programme (UNEP) report asserts that 1.5°C will be surpassed and emphasizes the need to navigate the warmer world while still striving to limit warming. Co-author Richard Betts from the University of Exeter stated that the report focuses on responses rather than simply acknowledging the reality. Fellow author Debra Roberts from the University of KwaZulu-Natal stressed the importance of policymakers reconfiguring climate governance to deal with an overshoot pathway, as their current plans are not prepared for this scenario.

Climate activists, while alarmed by the report, urged against giving up on the 1.5°C goal. Small island nations threatened by rising seas have been particularly vocal in supporting the 1.5°C target and have urged wealthier nations not to abandon the milestone even as it becomes less attainable.