This book addresses the rule of law in connection with technology and environment. The rule of law represents the heart of constitutionalism. Public power can only be legitimately exercised if it is based on and complies with the law. The Constitution and its fundamental values are the ultimate sources of orientation for the rule of law. Domestic rule of law is complemented by its external dimension, the duty to respect international law and, for EU member states, supranational law. For the World Jurist Association, the realization of the rule of law has been the central concern since its founding more than 60 years ago. Its biennial world congresses, which bring together leading figures from politics, the judiciary and academia under the presidency of Javier Cremades, focus on the universal importance of the rule of law, which experts from numerous countries discuss on the basis of current problem areas. At the 2023 World Law Congress in New York central topics were technology as well as climate protection, environment and energy.