Answer:
1. The Clean Air Act** (CAA) is a federal law that regulates air emissions from stationary and mobile sources. The CAA was enacted in 1970 to protect public health and the environment by reducing air pollution. The CAA has been amended several times since its enactment, and it is now one of the most comprehensive air pollution laws in the world.
2. The Clean Water Act** (CWA) is a federal law that regulates the discharge of pollutants into U.S. waters. The CWA was enacted in 1972 to protect human health and the environment by reducing water pollution. The CWA has been amended several times since its enactment, and it is now one of the most comprehensive water pollution laws in the world.
3. The Safe Drinking Water Act** (SDWA) is a federal law that regulates the quality of drinking water in the United States. The SDWA was enacted in 1974 to protect human health by ensuring that drinking water is safe to drink. The SDWA has been amended several times since its enactment, and it is now one of the most comprehensive drinking water laws in the world.