The 2015–2025 decade was the hottest on record, with 2024 the hottest year ever, driven by record greenhouse gas levels and a climate emergency.

The World Meteorological Organization confirms the 2015–2025 decade was the hottest on record, with 2025 ranking second or third hottest at 1.43°C above pre-industrial levels and 2024 the hottest at 1.55°C. Greenhouse gas levels hit record highs, driving a growing energy imbalance, with over 90% of excess heat absorbed by oceans, accelerating sea-level rise and ice melt. Glaciers and sea ice declined sharply, and extreme weather intensified despite a cooling La Niña. The UN warns the planet is in a climate emergency, with impacts already affecting ecosystems, communities, and infrastructure, underscoring the urgent need for global action.