The meeting between a major comic book author and an eminent specialist in energy issues resulted in this project. Intelligent, limpid, not devoid of humor, this book explains in the form of chapters the profound changes that our planet is currently experiencing and what consequences, already observed, these sometimes radical changes signify. Jean-Marc Jancovici supports his remarkably well-argued vision by placing the issue of energy and climate change at the heart of his thinking while evoking the economic issues. This enlightened testimony turns out to be precious, fascinating and invites reflection on sometimes divisive subjects, in particular that of energy transition