There is no better way to convince Pres. Trump of the value of NAFTA than by proposing a North American crude oil pricing regime.  Protect the oil industries in the three amigos by levying tariffs on "dumped" cheap OPEC oil imports which would result in higher crude prices for North American producers.  Label the tariff a "carbon tariff" and ... I guess we can't use this term with Pres. Trump ... voila!