Two Degrees: Guardrail? Or Guide Rail to Disaster?

by Kent Peacock

The idea that 2⁰C is a safe guardrail against global heating was a guesstimate by an economist almost fifty years ago, and it had a sketchy scientific basis even at that time. In November 2023, a consortium comprised of many of the top glaciologists and climate scientists in the world published a report entitled “The State of the Cryosphere 2023—Two Degrees is Too High.” (See also the review on Carbon Brief.)  The only hope of preventing catastrophic sea-level rise,