Book excerpt: The consensus is clear - climate change is the defining challenge of our time. Meeting this challenge requires a collaborative and inclusive response from all segments of society - including private businesses. What role then for competition law and policy? This important and timely book gathers academics, enforcers, economists, lawyers, and industry representatives to explore the applications and limitations of EU competition law in achieving environmental sustainability aims in line with the European Commission's Green Deal as well as the UN's Sustainable Development Goals. They identify the challenges of integrating environmental considerations into competition analysis presented by the existing framework, whether through cooperation by businesses, practices by dominant companies, or consideration of sustainability efficiencies in merger assessments. Practical examples across various sectors are also provided, alongside agency views from different jurisdictions, to illustrate how competition policy can facilitate a sustainable economy.