Overview
- A Coupled Model Intercomparison Project paper published in late May concluded RCP8.5’s extreme emissions are now implausible because faster renewable deployment and new policies have bent future emissions downward.
- The recommendation comes from CMIP modelers, not the IPCC, and lead author Detlef Van Vuuren and other scientists say the change reflects energy and policy trends rather than a collapse of climate science.
- Scientists warn that revised high‑end scenarios still allow very large warming — roughly up to about 3.5°C by 2100 — and that many models still do not fully capture risks such as rapid ice‑sheet melt.
- Political and media reactions have split: explanatory coverage in outlets like Forbes and AFP stressed context and remaining risks, while some partisan posts, including a May 16 Truth Social message by President Trump, mischaracterized the move as proof earlier projections were ‘wrong.’
- Practically, the shift means researchers, regulators and infrastructure planners must reassess studies and rules that used RCP8.5 without context, and maintain plans for severe impacts even as scenario ranges are updated.