Last year was the hottest year globally since records began in 1850, and the first calendar year to breach the 1.5°C temperature limit sought by the Paris climate agreement, EU earth-monitoring service Copernicus said today.
The global average surface air temperature in 2024 was 15.10°C — 0.12°C higher than previous hottest year 2023 and 0.72°C higher than the 1991-2020 average, Copernicus found.
The global average temperature in 2024 was 1.6°C higher than an estimate of the pre-industrial average, Copernicus data show — the first calendar year to breach the temperature limit pursued by the Paris accord. The two-year average for 2023-24 "also exceeds this threshold", Copernicus said. The Paris agreement seeks to limit the rise in temperature to "well below" 2°C above pre-industrial levels, and preferably to 1.5°C.
This "does not mean we have breached the limit set by the Paris agreement", which "refers to temperature anomalies averaged over at least 20 years", Copernicus said. But it "underscores that global temperatures are rising beyond what modern humans have ever experienced", the organisation added.
Each year of the past decade — 2015-24 — was one of the hottest ten years on record. And every month since July 2023, apart from July 2024, has breached the 1.5°C level, Copernicus data show.
Greenhouse gas (GHG) emissions "remain the main agent of climate change", director of Copernicus Atmosphere Monitoring Service Laurence Rouil said. GHG concentrations are the highest in at least 800,000 years, Copernicus said.
Atmospheric concentrations of key GHGs CO2 and methane "continued to increase and reached record annual levels in 2024", it said. CO2 stood at 422 parts per million (ppm) and methane at 1,897 parts per billion (ppb) in 2024 — 2.9ppm and 3ppb higher on the year, respectively, Copernicus data show. While the rate of increase in CO2 "was larger than the rate observed in recent years", the rate of increase in methane was "significantly lower than in the last three years", Copernicus said.
An international team of scientists said in November that carbon emissions from fossil fuels were projected to reach a fresh high in 2024, with "no sign" that these have peaked.
Global sea surface temperatures were also above average in 2024 and were a significant force behind the record high surface air temperatures, Copernicus said. Oceans absorb the majority of the world's excess heat. And the amount of water vapour in the atmosphere hit a fresh high in 2024, at around 5pc above the 1991-2020 average, Copernicus found. Climate change is worsening extreme weather events such as floods and storms, studies found. This "reflects the basic physics of climate change — a warmer atmosphere tends to hold more moisture, leading to heavier downpours", research groups World Weather Attribution and Climate Central said in December.
