Climate Change's Worst-Case Scenario RCP 8.5 Officially Retired
Climate Change's Worst-Case Scenario RCP 8.5 Officially Retired
US · Published May 24, 2026
The climate scenario known as RCP 8.5, which projected extreme global warming of up to 4°C to 5°C by 2100, has been officially retired by scientists.
This scenario, once widely used in climate impact studies and media coverage, was based on assumptions of unchecked fossil fuel use and population growth.
However, recent trends in emissions, clean energy advancements, and policy changes have rendered it implausible.

Why It's Important?

The retirement of RCP 8.5 signals a reduced likelihood of the most catastrophic climate outcomes, such as extreme heat, widespread crop failures, and severe sea-level rise. However, the revised estimate of 2.8°C warming by 2100 still poses significant risks, including intensified weather events, ecosystem disruptions, and challenges for vulnerable populations. While the worst-case scenario is no longer considered plausible, the current trajectory still demands urgent action to further reduce emissions and adapt to ongoing climate changes.

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