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2023 confirmed as planet Earth’s hottest year ever, and ‘very likely’ warmest in 100,000 years

In World
January 09, 2024

Last year was the planet’s hottest on record by a substantial margin and likely the world’s warmest in the last 100,000 years, the European Union’s Copernicus Climate Change Service (C3S) said on Tuesday.

Scientists had widely expected the milestone, after climate records were repeatedly broken. Since June, every month has been the world’s hottest on record compared with the corresponding month in previous years.

“This has been a very exceptional year, climate-wise … in a league of its own, even when compared to other very warm years,” C3S Director Carlo Buontempo said.

‘Climate breakdown has begun’, warns UN chief in hottest year on record

C3S confirmed 2023 as the hottest year in global temperature records, going back to 1850. When checked against paleoclimatic data records from sources such as tree rings and air bubbles in glaciers, Buontempo said it was “very likely” the warmest year in the last 100,000 years.

On average, in 2023 the planet was 1.48 degrees Celsius warmer than in the 1850-1900 pre-industrial period, when humans began burning fossil fuels on an industrial scale, pumping carbon dioxide into the atmosphere.

Countries agreed in the 2015 Paris Agreement to try to prevent global warming surpassing 1.5 Celsius (2.7 degrees Fahrenheit), to avoid its most severe consequences.

The world has not breached that target – which refers to an average global temperature of 1.5 Celsius over decades – but C3S said that temperatures had exceeded the level on nearly half of the days of 2023 set “a dire precedent”.


El Nino is here, and it’s quite worrying, according to climate scientists

El Nino is here, and it’s quite worrying, according to climate scientists

Record emissions

Despite the proliferation of governments’ and companies’ climate targets, CO2 emissions remain stubbornly high. The world’s CO2 emissions from burning coal, oil and gas hit record levels in 2023.

Last year, the concentration of CO2 in the atmosphere rose to the highest level recorded, of 419 parts per million, C3S said.

It was also the first year in which every day was more than 1C hotter than pre-industrial times. For the first time, two days – both of them in November – were 2 degrees warmer than in the pre-industrial period, C3S said.

What is making 2023 likely to be the hottest year recorded?

Last year was 0.17 degrees hotter than 2016, the previous hottest year – smashing the record by a “remarkable” margin, Buontempo said.

Alongside human-caused climate change, in 2023 temperatures were boosted by the El Nino weather phenomenon, which warms the surface waters in the eastern Pacific Ocean and contributes to higher global temperatures.

Each fraction of temperature increase exacerbates extreme and destructive weather disasters. In 2023, the hotter planet aggravated deadly heatwaves from China to Europe, extreme rain which caused floods killing thousands of people in Libya and Canada’s worst wildfire season on record.

A man cools off during a heatwave in Baghdad, Iraq in July 2023. Earth last year shattered global annual heat records, the European climate agency said on Tuesday. Photo: AP

“Comparable small changes in global temperatures have huge impacts on people and ecosystems,” Friederike Otto, a climate scientist who co-leads the World Weather Attribution global research collaboration.

“Every tenth of a degree matters,” she added.

The economic consequences of climate change are also escalating. The US suffered at least 25 climate and weather disasters with damages exceeding US$1 billion, National Centers for Environmental Information data show. Prolonged droughts ravaged soybean crops in Argentina and wheat in Spain.

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