All modes of transportation produce some pollution when the whole supply chain is looked at.
That is an obvious fact.
But some produce less than others.
Those running on electricity produced by natural gas, sunlight, nuclear,wind and yes even coal produce less on American energy sources.
And don’t feed the OPEC-Al Qaeda terrorist complex.
That’s one reason I’m thankful we are producing more. Not that there haven’t been obstacles, namely our commie islamo-facist leader and his minions.