Key climate indicators like greenhouse gas concentrations, global temperatures, ocean heat, and sea levels all reached record highs in recent years, according to the World Meteorological Organization's State of the Global Climate 2025 [4] report, released March 23. The past 11 years have been the warmest on record, with 2025 among the top three. Melting glaciers [7] and sea ice [8], rising seas, and extreme weather [9] are intensifying risks to ecosystems, health, and economies. With the 1.5° C warming limit established by the Paris Agreement [5] nearing, the report stresses urgent emissions cuts and stronger climate action.
"Every key climate indicator is flashing red," said UN Secretary-General Antonio Guterres. "Humanity has just endured the 11 hottest years on record. When history repeats itself 11 times, it is no longer a coincidence. It is a call to act."
Most alarmingly, the analysis found that the Earth is now retaining more solar energy than it releases into space. Most of this trapped heat is being absorbed by the world's oceans. Global ocean heat [10] reached a record high in 2025, and that measure has risen twice as fast over the past 20 years as it did over the previous 40. Impacts of the current imbalance are likely to last centuries if not millennia. (TNH [11], DW [12], PRI [13], Scientific American [14])
