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This situation has concluded and was preserved as a record on July 26. The timeline below shows how it unfolded, with sources.

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9 clusters · 387 sources · 27 days · First seen · Last updated

Categories: INTERNATIONAL · POLITICS

IPCC RCP8.5 scenario deemed implausible

Overview

In early May 2026 the World Meteorological Organization’s climate state report highlighted a record global energy‑heat imbalance and noted that the Intergovernmental Panel on Climate Change (IPCC) had removed its most extreme warming pathway. The following day the IPCC formally declared the high‑emissions Representative Concentration Pathway 8.5 (RCP 8.5) “implausible,” questioning decades‑long climate forecasts that had relied on that scenario.

Subsequent coverage throughout the month reported how the ruling affected policy modelling, especially in the United Kingdom where the Met Office had used RCP 8.5 in its climate projections. Analysts linked the shift to slower coal growth, falling renewable‑energy costs and stronger climate policies. The decision sparked political reactions, notably praise from former U.S. President Donald Trump, while scientists stressed that even the remaining, more plausible pathways still project warming well above the Paris‑Agreement targets.

Parallel research showed that global climate indicators continued to deteriorate, with the average warming reaching 1.26 °C above pre‑industrial levels and the Earth’s energy imbalance tripling since the 1980s. An international team of researchers formally retired RCP 8.5, and later analyses underscored that medium‑emission scenarios still imply 2‑3 °C of warming by 2100. A WMO forecast at the end of May projected record or near‑record global surface temperatures for 2026‑2030, with a high probability of temporary exceedance of the 1.5 °C threshold.

Timeline

  1. 2 months ago

    [INTERNATIONAL] 342 sources
    UN climate report warns of record global heat and rapid Arctic warming by 2030

    UN WMO report says 75% chance global average 2026‑2030 will exceed 1.5 °C, 86% that a year will beat 2024's heat record, with strong El Niño and rapid Arctic warming.

  2. 2 months ago

    [INTERNATIONAL] 2 sources
    Climate scientists deem RCP8.5 worst‑case scenario implausible

    Researchers say the RCP8.5 worst‑case climate scenario is no longer plausible due to falling renewable costs and stable coal use, but warn about 2.7 °C warming by 2100 remaining likely.

  3. 2 months ago

    [INTERNATIONAL] 2 sources
    International Climate Researchers Retire RCP8.5 Emissions Scenario

    Global climate scientists retire the high‑emissions RCP8.5 pathway as implausible, prompting scientific debate and political commentary, while warning that medium scenarios remain dangerous.

  4. 3 months ago

    [INTERNATIONAL] 12 sources
    IPCC Drops Extreme RCP 8.5 Scenario, Revises Global Warming Outlook

    IPCC deems the extreme RCP 8.5 climate scenario implausible, revising worst‑case warming to ~3.5 °C, still above the 1.5 °C goal.

  5. 3 months ago

    [POLITICS] 13 sources
    UN IPCC revises climate forecast, Trump celebrates the change

    IPCC drops extreme 4‑5 °C warming scenario; Trump lauds the change as a political victory.

  6. 3 months ago

    [INTERNATIONAL] 3 sources
    Global climate indicators deteriorate sharply over the past five years

    New five‑year data shows all key climate indicators worsening, with accelerated warming and a near‑tripled Earth energy imbalance.

  7. 3 months ago

    [POLITICS] 2 sources
    IPCC rules high‑emissions climate scenario RCP8.5 implausible, sparking critique of net‑zero policies

    IPCC declares RCP8.5 implausible, undermining climate forecasts that have driven net‑zero policies and sparking media silence.

  8. 3 months ago

    [INTERNATIONAL] 2 sources
    IPCC declares RCP8.5 climate scenario implausible, undermining decade‑long forecasts

    IPCC says the RCP8.5 climate scenario is implausible, shaking many policies and forecasts built on it.

  9. 3 months ago

    [INTERNATIONAL] 9 sources
    World Meteorological Organization reports record heat imbalance as IPCC drops extreme warming scenario

    WMO reports record climate heat imbalance; IPCC drops its extreme 4‑6 °C warming scenario.

Sources

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