Turning "environmental regulation" into a unified bloc that must be either supported or opposed in totality is a manipulative political maneuver and it should be forcefully rejected.
Regulations are not people, and they don't have rights. It is fair and reasonable to demand that environmental regulation justify its existence with hard, scientifically verifiable data or else get chopped. Clearly, banning leaded gasoline has that kind of justification, and therefore I'm strongly in favor of maintaining that ban and extending it wherever it isn't in place yet. The same reasonable standard should be applied to other regulations across the board.
2. Germany or at least the EU can and should impose a carbon fee on imports related to a given nations carbon emissions/reductions.
3. Economically transitioning to renewables is better for a nations economy than continuing to burn fossil fuels anyway. Renewables are cheaper.
Pointing to another bad actor as an excuse to continue to be a bad actor we learn is not a moral position somewhere around 5 years old.