Présentation en anglais At once wide-ranging and insightful, this primer provides the conceptual and scientific background necessary for understanding the multiple facets of energy issues - from geology and geopolitics to geography and economics - that will dominate policy and economic choices over the coming decades. Philippe Le Prestre Director, Institut Hydro-Québec en Environnement, Dévéloppement et Société Université Laval, Quebec At a time when the topic of energy is front and centre, this book examines the basic concepts that are essential to grasping the energy issues of the 21 st century. All the main questions that people have about energy, especially oil and gas, are addressed, providing students, academics, journalists, representatives of government and other institutions and interested readers in general with the information they need to understand the complex, multifaceted energy sector. Abundantly illustrated, this book represents five years of exhaustive research on a fascinating and highly controversial topic. It discusses all the processes related to fossil forms of energy, from the formation of hydrocarbons (crude oil and natural gas) to the delivery of oil and gas to consumers. It also examines renewable energy options and climate change issues in addressing the major geopolitical challenges facing the energy sector. Bilan des ressources énergétiques sur le plan économique, géologique et géomorphologique à partir d une étude des énergies comme le gaz et le pétrole mais aussi des énergies renouvelables.