美国正式“退群”，联合国表态！

Core Viewpoint - The article discusses the United States' formal withdrawal from the Paris Agreement, highlighting the implications and reactions from the United Nations regarding climate commitments [1][3]. Group 1: U.S. Withdrawal from the Paris Agreement - On January 20, 2025, President Trump signed an executive order declaring the U.S. withdrawal from the Paris Agreement, with the exit officially taking effect on January 27, 2026 [1]. - The U.N. Secretary-General's spokesperson emphasized that all countries must fulfill their obligations to combat climate change and opposed any attempts to evade these commitments [3]. Group 2: Historical Context - The Paris Agreement was established during the 2015 U.N. Climate Change Conference as a significant global effort to address climate change [3]. - The U.S. initially announced its intention to withdraw from the agreement in June 2017, with the formal exit occurring on November 4, 2020, which faced widespread criticism domestically and internationally [3]. - President Biden signed an executive order on his first day in office, January 20, 2021, to rejoin the Paris Agreement, with the U.S. officially rejoining on February 19, 2021 [3].