2024 Still on Track to Be First Full Year That Breached 1.5°C

Data from the first 11 months of 2024 reaffirmed that the globe is set to pass a grim milestone this year, according to the European Union's earth observation program.

The E.U.'s Copernicus Climate Change Service (C3S) said in a report Monday that November 2024 was 1.62°C above the preindustrial level, making it the 16th month in a 17-month stretch during which global-average surface air temperature breached 1.5°C. November 2024 was the second-warmest November, after November of last year, according to C3S.

"At this point, it is effectively certain that 2024 is going to be the warmest year on record and more than 1.5°C above the pre-industrial level," according to a Monday statement from C3S. With data for November in hand, the service estimates that global temperature is set to be 1.59°C above the pre-industrial level for 2024, up from 1.48°C last year.

C3S announced last month that 2024 was "virtually certain" to be the hottest year on record after October 2024 hit 1.65°C higher than preindustrial levels.

"This does not mean that the Paris Agreement has been breached, but it does mean ambitious climate action is more urgent than ever," said Samantha Burgess, deputy director of C3S.

Under the 2015 Paris agreement, signatory countries pledged to reduce their global greenhouse gas emissions with the aim of keeping global temperature rise this century to 1.5ºC, well below 2°C above preindustrial levels. According to the United Nations, going above 1.5ºC on an annual or monthly basis doesn't constitute failure to reach the agreement's goal, which refers to temperature rise over decades—however, "breaches of 1.5°C for a month or a year are early signs of getting perilously close to exceeding the long-term limit, and serve as clarion calls for increasing ambition and accelerating action in this critical decade."

Additionally, a recent paper in the journal Nature warned of irreversible impacts from overshooting the 1.5ºC target, even temporarily.

Climate scientist and volcanologist Bill McGuire reacted to the news Monday, saying: "Average temperature for 2024 expected to be 1.60°C. A massive hike on 2023, which itself was the hottest year for probably 120,000 years. No surprise at all, but still shocking news. Will temperatures drop below 1.5°C again? I have my doubts."

The update comes on the heels of COP29, the most recent U.N. climate summit, which many climate campaigners viewed as a disappointment. During the summit, attendees sought to reach a climate financing agreement that would see rich, developed countries contribute money to help developing countries decarbonize and deal with the impacts of the climate emergency. The final dollar amount, according to critics, fell far short of what developing countries need.