Environmental approaches to the reduction of alcohol problems differ from more traditional approaches in a number of ways. First, whereas traditional approaches are information-based and attempt to persuade youth to avoid alcohol and other drugs, the environmental approach implements policy change designed to reduce substance use. Second, whereas the objective of traditional programs is to change individual behavior, the goal of the environmental approach is to achieve system change in the community. Third, to the extent that the mass media strategically use traditional programs to target individuals, the environmental approach targets key community leaders and policymakers. Fourth, whereas traditional programs view community members as targets, the environmental approach harnesses and mobilizes their energies in the pursuit of policy change. The youth access component of the Community Trials Project is an example of an environmental approach to reducing underage drinking. Designed to reduce alcohol-related injuries among youth, it involves community organization and support to reduce underage drinking; standards for business owners to reduce underage customers in bars and restaurants that serve alcoholic beverages; a program to increase the actual and perceived risk that intoxicated drivers will be detected; and the use of local zoning powers and other municipal controls to reduce the availability of alcohol. Evaluation results and policy implications of this project are discussed.