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2023 Virtually Certain to Be the Hottest Year on Record, Scientists Say

October 2023 was the warmest October on record globally, according to data from European climate scientists released on Wednesday. It comes on the heels of the hottest September on record and the hottest summer months globally, rounding out a year of record temperatures around the planet.

“We can say with near certainty that 2023 will be the warmest year on record, and is currently 1.43 degrees Celsius above the preindustrial average,” Samantha Burgess, deputy director of the Copernicus Climate Change Service, said in a statement.

The analysis, which relies heavily on computer modeling, uses billions of measurements from satellites, ships, aircraft and weather stations around the world. The difference in global temperature compared with the long-term average for October 2023 was the second highest across all months in the Copernicus data set, behind only September 2023. The analysis includes data from January 1940 to the present.

About September’s data, Zeke Hausfather, a research scientist at Berkeley Earth, writes: “As global temperatures shattered records and reached dangerous new highs over and over the past few months, my climate scientist colleagues and I have just about run out of adjectives to describe what we have seen.”

The United Nations Climate Change Conference, known as COP28, is scheduled to begin in Abu Dhabi in the United Arab Emirates at the end of the month.

“The sense of urgency for ambitious climate action going into COP28 has never been higher,” Dr. Burgess said.

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