It's never this simple. There are multitudes of interested parties in either direction not just at the federal level, but below it from state, to county, to city and more.
They have a say. Everyone is going to throw in their two cents here. A policy change like this involves the legislative branch which involves everyone. Even corporate interests.
It's not going to be some scientists making a statement and then the federal government putting their hammer down. In china I can see this happening, but in the US it's a democracy.