世界气象组织：2024年大气二氧化碳浓度和增幅均创历史新高

Core Insights - The World Meteorological Organization (WMO) reported that carbon dioxide (CO2) levels in the atmosphere are set to reach a historic high in 2024, with a record increase compared to 2023 [1][2] - Human activities and frequent wildfires are identified as primary contributors to the rise in CO2 levels, alongside a reduction in the ability of land and ocean ecosystems to absorb CO2, potentially leading to a climate feedback loop [1][2] Summary by Sections CO2 Concentration Data - The average global CO2 concentration rose from 377.1 ppm in 2004 to 423.9 ppm in 2024, marking an increase of 3.5 ppm from 2023 to 2024, the largest annual increase since modern measurements began in 1957 [1] - Methane and nitrous oxide, the second and third largest greenhouse gases, also reached record levels in 2024, with average concentrations of 1942 ppb and 338 ppb, respectively [1] Carbon Absorption and Climate Impact - Approximately half of the total annual CO2 emissions remain in the atmosphere, while the rest is absorbed by terrestrial ecosystems and oceans, a process known as "carbon sinks" [2] - Rising global temperatures are expected to diminish the ocean's capacity to absorb CO2, and various factors, including prolonged droughts, may affect land carbon sink capabilities [2] Importance of Emission Reduction - The WMO emphasizes that the heat captured by CO2 and other greenhouse gases is accelerating climate warming, leading to more extreme weather events, making emission reduction critical for climate stability, economic security, and social welfare [2] - The report serves as authoritative scientific information for the upcoming 30th Conference of the Parties to the United Nations Framework Convention on Climate Change, highlighting the long-term impact of CO2 emissions on global climate [2]