The first edition of this book, Energy Law and the Environment, was published in 2002 and was the first one in the field that considered the legal environmental imperatives for the energy sector. The first edition was written to be accessible to both lawyers and non-lawyers alike and the same theme continues in this, the second edition. However, the interest and concerns of policymakers, multinational companies, and international jurists have expanded to consider not only what should be done to protect global resources for sustainable development but also why. To this end, the second edition considers how the international law engages with multinationals in respect of energy sources, ownership of those resources, and state sovereignty. The book also considers issues of regulation of the energy sector within an economic context and the need for protection of the intellectual property rights of those companies who develop the technology that will help both the developed and the developing nations mitigate any environmentally damaging emissions. The scope of the book has enlarged and so the title has been changed to more realistically reflect the development in the area to International Law for Energy and the Environment. This edition has been written for all the actors within the energy sector. Policymakers, CEOs, and senior managers of any company, working either upstream or downstream, within the energy sector will benefit from greater knowledge and understanding of the legal issues. Engineers working in research and development will have an understanding of the intellectual property rights and the broader legal context within which they and their company operate. The book will also benefit those who are studying at undergraduate level, but more so those at postgraduate level on an MBA or a legal course.