This report discusses the effect of human activities on global climate change. Human activities, particularly burning of fossil fuels, have increased atmospheric carbon dioxide (CO2) and other trace gases, including chlorofluorocarbons (CFCs), methane, and nitrous oxide.
The Clean Air Act Amendments of 1990 encourage states to pursue market-based approaches to improve air quality. An Accelerated Vehicle Retirement (AVR) program, commonly referred to as "Cash for Clunkers," is designed to provide an economic incentive for the owners of highly polluting vehicles to retire their automobiles permanently from use and to provide greater flexibility for private industry to reduce emissions by sponsoring such a program. The implementation of AVR programs can be controversial. This report discusses the AVR program debate and includes information on completed AVR pilot projects in selected states.