Heinberg has helped thousands of readers understand what our energy future may look like. He considers what we know at this time, the science of what various alternative energy sources can provide, and the opinions of experts in a variety of relevant fields to form his predictions. He speaks calmly and in as positive a tone as he can wring from the facts. He avoids deadening the discourse with excessive detail, and includes practical suggestions to prepare for the future. This is a good introduction for nonscientists to the coming energy descent.