Résumé : In February 2025, the South Korean government promised a long-term plan to achieve carbon neutrality by 2050, whereas previous plans were limited to 2030. In this post, I examine how a court case considering the United Nations (UN) Framework Convention on Climate Change influenced this shift. The Constitutional Court’s ruling in D.H. Kim et al v Korea on 29 August 2024, made while I was in South Korea, marked a historic decision. I explain that the judges creatively linked the constitutional principle of ‘statutory reservation’ to the international environmental law principle of intergenerational equity.