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\t\t\t\t\t\t13\/11\/2024<\/span> A new European Space Agency-backed study shows that the extreme heatwaves of 2023, which fuelled huge wildfires and severe droughts, also undermined the land\u2019s capacity to soak up atmospheric carbon. This diminished carbon uptake drove atmospheric carbon dioxide levels to new highs, intensifying concerns about accelerating climate change.<\/p>\n<\/div>\n Measurements from Hawaii’s Mauna Loa Observatory showed that atmospheric carbon concentrations surged by 86% in 2023 compared to the previous year, marking a record high since tracking began in 1958.<\/p>\n Despite this sharp increase, fossil fuel emissions only rose by about 0.6%, suggesting that other factors, such as weakened carbon absorption by natural ecosystems, may have driven the spike.<\/p>\n Supported by ESA\u2019s Science for Society Near-Realtime Carbon Extremes project and the Climate Change Initiative RECCAP-2 project, an international team of scientists analysed global vegetation models and satellite data to investigate the underlying causes and deliver an expedited carbon budget report for 2023.<\/p>\n Typically, land absorbs roughly one-third of human-generated carbon dioxide emissions. However, the team\u2019s\u00a0research\u00a0published in National Science Review reveals that in 2023, this capacity fell to just one-fifth of its usual level, marking the weakest land carbon sink performance in two decades.<\/p>\n<\/p><\/div>\n The graph above shows changes in the declining northern land carbon sink (blue) and the variations of tropical land flux (green) for 2015\u20132023. The solid lines reflect analyses using dynamic global vegetation models while the dotted lines are based on data from NASA\u2013JPL\u2019s Orbiting Carbon Observatory-2 mission.<\/p>\n Philippe Ciais, from France\u2019s Laboratory for Climate and Environmental Sciences, explained, \u201cOur research shows that 30% of this decline was driven by the extreme heat of 2023, which fuelled massive wildfires that ravaged vast areas of Canadian forest and triggered severe drought across parts of the Amazon rainforest.<\/p>\n \u201cThese fires and droughts led to substantial vegetation loss, weakening the land ecosystem\u2019s ability to absorb carbon dioxide. This was further compounded by a particularly strong El Ni\u00f1o, which historically reduces the carbon absorption capacity in the Tropics.\u201d<\/p>\n Widespread wildfires across Canada and droughts in the Amazon in 2023 released about the same amount of carbon to the atmosphere as North America\u2019s total fossil fuel emissions, underscoring the severe impact of climate change on natural ecosystems.<\/p>\n<\/p><\/div>\n The Amazon \u2013 one of the world\u2019s most crucial carbon sinks \u2013 is showing signs of long-term strain, with some regions shifting from absorbing carbon to becoming net sources of carbon emissions.<\/p>\n The researchers suggest that the declining capacity of Earth\u2019s land ecosystems to absorb carbon dioxide may indicate that these natural carbon sinks are nearing their limits and no longer able to provide the mitigation service they have historically offered by absorbing half of human-induced carbon dioxide emissions.<\/p>\n \u201cConsequently, achieving safe global warming limits will require even more ambitious emission reductions than previously anticipated,\u201d stated Philippe Ciais.<\/p>\n The study also highlights that current climate models might be underestimating the rapid pace and impact of extreme events, such as droughts and fires, on the degradation of these crucial carbon reservoirs.<\/p>\n<\/p><\/div>\n Stephen Plummer, ESA Earth Observation Applications Scientist, noted, \u201cUnderstanding the knock-on effects of climate change on the carbon cycle is imperative and the two ESA study projects demonstrate the importance of Earth observation in the development of methodologies to provide rapid assessment of these impacts globally.\u201d<\/p>\n ESA\u2019s Acting Head of the Actionable Climate Information Section, Clement Albergel, added, \u201cThese results are particularly alarming, especially considering the difficulty the world is having limiting warming to 1.5\u00b0C, as laid out in the Paris Agreement.\u201d<\/p>\n<\/p><\/div>\n
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