What is the name of the fund established by Congress in 1980 to address hazardous waste site clean-up?

The correct answer is the Superfund. This fund was established by the Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA) in 1980, specifically to address the growing concern over hazardous waste sites and the pollution they cause. The Superfund program's main objective is to clean up contaminated sites and ensure that responsible parties are held accountable for the cleanup.

The name "Superfund" reflects the program's extensive financial resources designed to aid in the cleanup operations and to facilitate a more effective response to environmental disasters. The Superfund program helps the government fund the necessary investigations, cleanup actions, and health-related assessments at these hazardous sites, ultimately benefiting public health and the environment.

In contrast, other names listed do not correspond to this specific fund: the Toxic Waste Fund is not a recognized program, and while Environmental Impact is related to assessments of potential impacts before projects are initiated, it does not pertain to cleanup funding. The National Environmental Fund does not exist as a specific program, and thus is not applicable to hazardous waste cleanup efforts established in 1980. Therefore, the Superfund is the appropriate and accurate choice for this question.