Today’s society uses an enormous amount of energy. Indeed, the longest shadow of our presence on the planet comes as the result of our production, generation and utilization of energy. New sources of energy are being developed to replace declining accessible fossil fuel supplies and to reduce our impact on the climate as the result of greenhouse gas emissions. Yet there is no perfect energy source. Each and every one has its own advantages and compromises. This series will explore the pros and cons of various energy sources.