A comprehensive and critical treatment of the greenhouse gas/global warming issue and its relationship to other atmospheric environmental problems. Topics covered are: energy and emission scenarios, the carbon cycle, the climate response; impacts on agriculture, forests, water supply, sea level, and ecosystems; technical solutions, government policy options, citizen activism, and individual actions. By the end of course you should be able explain in simple terms the basic features of the climate and carbon cycle response to human emissions of greenhouse gases and the reasons for these features, be aware of the varying degrees of certainty or uncertainty associated with the major projected changes and the associated risks and understand what would need to be done to limit the damage and how it could be done in broad terms.