- Tariffs will increase the price of virtually everything -> By law of supply and demand; global trade and production will decrease, leading to less CO2 production
- This effect will be stronger for stuff coming from far away (little for Canda / Mexico; more for EU; huge for China). So companies will have a tendency to rely on local producer (even at a higher price). This again will lower transoceanic shipping. Other countries will probably retaliate so this effect will go both for inbound and outbound shipping. Again; less CO2 production
- More money for the government. There more stuff you buy, the more tariffs you pay, so rich pay more than poors. Which again is what green parties are looking for.
I might be very wrong about this; I am not a Trump supporter in any way - and to be honest I ma not a fan of green parties either - but my initial reaction is that if we look at the conclusion of the policies; the results are looking to align quite well. Of course the surrounding storytelling is extremely different; which puzzles me a bit.