Everything on planet earth is finite, without exception. At the same time, everything can be renewed. The question of renewability is more about how much effort it is to return something to its original state to be used again. Iron is comparatively easy to refine back into its pure, usable form.

I know you are being facetious, but for the sake of argument, at some point, the tariffs are so big, no trade is happening, so it doesn’t matter how “big” the tariff numbers are at that point, it’s all the same.

Because gaps in data are a thing? I dunno, it doesn’t really seem to change the story or the outcome. Your concerns seem overblown.