International Climate Researchers Retire RCP8.5 Emissions Scenario

An international team of climate scientists has published a major revision of the emissions pathways used in global‑warming research, declaring the high‑emissions scenario RCP8.5 "implausible" in light of recent energy trends. The scenario, which projected a rise of about 4.4 °C by 2100, had been a cornerstone of thousands of climate studies for more than a decade. Its removal has sparked debate among researchers about the value of studying extreme outcomes, while some political figures, including former U.S. President Donald Trump, have seized on the change to claim the climate threat is overstated.

Scientists stress that even the more plausible medium‑emission pathways still entail serious risks, and the revision is expected to reshape how future climate impacts are modeled and communicated.