Global warming reached one-point-three-seven degrees Celsius in 2025, driven almost entirely by human activities, according to a major new scientific report. Greenhouse gas emissions hit a record high of fifty-six-point-eight billion metric tons in 2024. The remaining carbon budget to stay within one-point-five degrees of warming will be exhausted in around three years at current emission rates. Marine heatwaves have more than tripled since nineteen-ninety-one, and sea levels have risen twenty-three centimeters since nineteen-oh-one.