These studies are extremely hard to reproduce exactly. The time, and that would be counted in decades, makes it almost impossible to reproduce. This bill is trying to sound sanctioned by the scientific community by using this wording. They don't understand environmental science nor want to. And the EPA is given its powers by the constitution, the fifth amendment. Granted EPA wasn't spelled out by Madison, but the power to protect the environment and the people of this country by regulation is granted by the fifth amendment.