中国气象局答21：全球温室气体浓度增量创纪录，有三大原因

Core Viewpoint - The global near-surface concentrations of three major greenhouse gases continue to rise in 2024, with carbon dioxide reaching an average concentration of 423.9 ppm, marking the largest annual increase since modern observations began in 1957 [1][2]. Group 1: Greenhouse Gas Concentrations - The average annual increase of carbon dioxide in 2024 is 3.5 ppm, the highest recorded since 1957 [1]. - Methane and nitrous oxide concentrations are reported at 1942 ppb and 338 ppb, respectively [1]. Group 2: Contributing Factors - The increase in carbon dioxide emissions is attributed to the ongoing rise in fossil fuel combustion, with a reported increase of 0.8% in emissions from 2023 [1]. - A reduction in global carbon sinks is noted, with a decrease of approximately 16% in 2023 due to long-term climate warming and the El Niño phenomenon, which has affected the carbon absorption capacity of terrestrial ecosystems [1]. - An increase in global wildfires has led to additional carbon emissions, with the Americas experiencing record-high emissions, particularly in South America, due to ongoing droughts and climatic anomalies [2].