Saying that there is no such thing as a free lunch is a glib way of expressing the first law of thermodynamics and gets at the core of this class. How do our choices in energy use impact the global and local environment? What does the future hold in terms of human use of energy? This class emphasizes the physical principles behind energy and the effects of energy use on the environment. We will explore the interdependence of world economies and environment as well as look at individual opinions and choices on energy related issues. Also offered as ENRG 380.