The proceedings document state and federal efforts described at a December 3-4, 1990, workshop that explored how states have been responding to potential global climate change. Cosponsored by the National Governors' Association (NGA) and the U.S. Environmental Protection Agency (EPA), the proceedings present some of the findings that emerged from discussions among the participants. Despite uncertainty about the extent, rate, and timing of a temperature increase, many state governments are wasting no time in working to reduce their greenhouse gas emissions as research on the effects of these gases continues. Fortunately, nearly all methods to curb emissions of greenhouse gases produce other benefits as well, such as cleaner air, reduced energy costs, and natural resource conservation. Therefore, most programs to reduce emissions will reflect concern about environmental and energy issues as well as global climate change.