The emergence of unconventional oil and gas extraction, known as the "shale revolution", since 2008 has fundamentally reshaped the global energy sector. This revolution, driven by technological advancements in hydraulic fracturing and horizontal drilling, has unlocked vast reserves of oil and gas previously deemed inaccessible. Despite challenges like the COVID-19 pandemic, fluctuating oil prices, and growing environmental concerns, unconventional resources continue to play a pivotal role in shaping energy policies worldwide. This book delves deeply into the transformative impact of unconventional resources on international energy markets and policies, providing a comprehensive analysis of their significance. Written by over 20 experts in oil and gas law, the book offers a rich, multidisciplinary perspective. It covers topics that are "horizontal" and cut across various jurisdictions, providing a comparative approach that spans 11 different countries, including the USA, Canada, Argentina, Brazil, Colombia, Mexico, the UK, Algeria, Libya, China, and Germany. This extensive analysis ensures a broad understanding of the global landscape of unconventional resources. Main themes include: ·         Global Impact: Unconventional resources have not only transformed the United States into a leading oil and gas producer but have also significantly influenced energy strategies worldwide. Countries across North America, South America, Europe, and Asia have adopted various strategies to harness these resources, reshaping the global energy market. ·         Policy Considerations: Key policy issues addressed in the book include the environmental and social impacts of unconventional resource extraction. Topics such as water management, the coexistence of drilling operations with other land uses, and the social implications of resource extraction are thoroughly examined. ·         Legal Framework: The book explores the complex legal landscape governing unconventional operations, delves into stakeholder dynamics, regulatory frameworks, and the intricacies of legal provisions that vary from one jurisdiction to another. ·         Geographical Analysis: In its second part, the book provides an in-depth analysis of specific country regulations. This section offers comparative insights into the regulatory approaches of eleven countries, highlighting both common challenges and unique strategies. The book concludes by exploring lessons learned and future perspectives within the framework of the energy trilemma—balancing energy security, environmental sustainability, and economic affordability. It emphasizes the transformative impact of unconventional resources on energy independence and security, while also addressing the contentious environmental considerations that accompany such developments. Overall, this book aims to equip readers with a comprehensive understanding of the legal and regulatory landscape surrounding unconventional oil and gas resources. By examining global experiences and diverse regulatory frameworks, it seeks to inform decision-making processes and promote sustainable development in the unconventional energy sector. The book benefits from critical analyses and comparative descriptive reviews of each country's unique approach, making it an invaluable resource for policymakers, industry professionals, and scholars alike.