International environmental law is the academic field and body of legal scholarship concerned with the international rules, principles, and institutions designed to prevent, mitigate, and respond to environmental harm, particularly that which is transboundary or global in scope. It investigates the sources, development, implementation, and effectiveness of international legal norms addressing issues such as climate change, biodiversity conservation, and pollution, analyzing the complex interplay between international relations, national legal systems, and scientific understanding in shaping global environmental governance for protection and sustainable development.