A recent paper from the ScenarioMIP committee suggests that the IPCC's high-end emissions scenario, SSP5-8.5, is now considered implausible. This scenario previously served as a primary basis for many global climate policies, bank stress tests, and carbon regulations. The shift calls into question the projections used by governments and financial institutions to plan sea walls, price insurance risk, and design emissions trading systems. It highlights a growing gap between worst-case theoretical models and actual global energy trends.
