Final answer:
The Environmental Protection Agency (EPA) has discretionary authority over developing and proposing new environmental policies, implementing regulations to reduce greenhouse gas emissions, and conducting research on pollution's impact on public health.
Step-by-step explanation:
The Environmental Protection Agency (EPA) has discretionary authority over several areas related to environmental protection. One example is developing and proposing new environmental policies and standards for consideration by Congress. This means that the EPA has the power to suggest and create new regulations and laws pertaining to environmental issues. Another area within the EPA's discretionary authority is implementing regulations mandated by Congress to reduce greenhouse gas emissions. The EPA is responsible for putting in place and enforcing regulations that aim to reduce the levels of greenhouse gases emitted into the atmosphere. Lastly, the EPA has the authority to conduct research to assess the impact of pollution on public health. This involves studying pollution's effects on human health and gathering data to inform decision-making and policy development.