Why has global warming accelerated recently?
Faster warming in the past decade
Scientists report that the planet’s rate of warming has increased markedly since about 2015. Analyses of multiple temperature datasets show the recent decade has warmed at roughly 0.35°C per decade — about twice the long‑term pace observed from the 1970s through 2015, which averaged just under 0.2°C per decade. That jump is not driven solely by short‑term weather patterns: researchers accounted for known natural fluctuations such as El Niño and still found a clear upward trend.
The practical meaning is stark. Record hot years in the early 2020s have pushed global temperatures toward thresholds policymakers set as guardrails — most notably the 1.5°C target in the Paris Agreement — sooner than many earlier projections anticipated. Faster warming increases the frequency and intensity of extreme heat, exacerbates drought and wildfire risk, accelerates ice loss in polar regions, and raises sea‑level rise projections.
Key pieces of evidence include:
- Multiple independent temperature records converging on an accelerated trend.
- Attribution studies showing that human greenhouse‑gas emissions are the primary driver of the long‑term rise.
- Recent record‑hot years and extreme events consistent with a faster warming background state.
What this means going forward
Policymakers and planners face a shorter window to avoid the most severe impacts. Faster warming reduces the time available to scale up emissions cuts, roll out adaptation measures, and shore up vulnerable infrastructure. It also increases the urgency of early warning systems for heat, floods and wildfires, and heightens the need to revise sea‑level and climate risk assessments that underlie coastal planning.
Uncertainties remain about the precise timing and regional details of impacts, so researchers call for continued high‑quality observations, improved climate models, and rapid policy action to limit further warming.