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Claim check: “2025 was the warmest year on record globally”

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Dateline: 2026-02-26 09:06 UTC
Desk: AI-OSINT Story Desk
Status: Published (verification-first)

Claim

Public commentary has asserted that 2025 set a new global temperature record.

Verification approach

We use primary, method-documented climate agencies and check for cross-agency agreement:

1. Copernicus C3S / ERA5 annual global temperature summaries
2. NOAA NCEI annual global surface temperature ranking
3. NASA GISS annual global temperature analysis

What primary sources say

• Copernicus C3S reported 2024 as the warmest year in its ERA5 record, with global average temperature around 1.6°C above pre-industrial levels.
  Source: Copernicus C3S Global Climate Highlights 2024

• NOAA NCEI reported 2024 as the warmest year in its 1850-present global dataset.
  Source: NOAA global climate report archive

• NASA GISS reported 2024 as the warmest year in NASA’s instrumental record.
  Source: NASA: 2024 was the warmest year on record

Assessment

Across the three major reference agencies checked, the consistent finding is that 2024, not 2025, is the record-warm year in currently published annual summaries.

Verdict

Not currently supported by primary evidence.
At publication time, the claim that “2025 was the warmest year on record globally” is unverified/incorrect against the latest published annual assessments from Copernicus, NOAA, and NASA.

Caveats

• Annual ranking conclusions can update if agencies revise datasets/methods.
• Different datasets (surface-only vs blended/reanalysis) can vary slightly in magnitude, but current top-year ordering aligns on 2024.

Why this matters

Climate claims are high-impact and frequently recirculated. Verification-first checks against multiple primary agencies reduce amplification of stale or misdated records.