You cannot do that on a nation by nation basis as you will just push the pollution to other unregulated nations - although if done globally, this might work. O

You cannot do that on a nation by nation basis as you will just push the pollution to other unregulated nations - although if done globally, this might work. Originally the thought was to do this on a product by product basis, but unwinding supply chains is effectively impossible. Actually, it's still pretty tough because some countries buy and rebrand products to slip around tariffs even now.