Final answer:
The President of the United States issues executive orders regarding environmental protection, which are implemented by the Environmental Protection Agency (EPA). This agency enforces environmental regulations and is overseen by an administrator.
Step-by-step explanation:
The entity responsible for issuing executive orders regarding environmental protection at the federal level is the President of the United States.
These orders are then implemented by the Environmental Protection Agency (EPA), an agency of the U.S. federal government created for the purpose of protecting human health and the environment. The EPA enforces regulations based on laws passed by Congress and is led by an administrator appointed by the president with Congress approval.
The Clean Air Act and the Clean Water Act are examples of command-and-control environmental regulations that the EPA oversees, which have greatly contributed to America's cleaner air and water over the past decades.