As the BBC reported before today’s IPPC special report, “for decades, researchers argued the global temperature rise must be kept below 2C by the end of this century to avoid the worst impacts. But scientists now argue that keeping below 1.5C is a far safer limit for the world. Everyone agrees that remaining below that target will not be easy.” Going for Gold in the Understatements Olympics?
Any assertions on goals we think humanity can achieve should be preceded by two blinders from the report:
- “Human-induced warming reached approximately 1°C (±0.2°C likely range) above pre-industrial levels in 2017, increasing at 0.2°C (±0.1°C) per decade (high confidence).”
- “If all anthropogenic emissions … were reduced to zero immediately, any further warming beyond the 1°C already experienced would likely be less than 0.5°C over the next two to three decades (high confidence), and likely less than 0.5°C on a century timescale (medium confidence), due to the opposing effects of different climate processes and drivers. Warming greater than 1.5°C is therefore not geophysically unavoidable: whether it will occur depends on future rates of emission reductions.”