Well, uranium could be an example. The US doesn't mine much of it anymore - instead, they buy most of what they need from Russia. There's still plenty of it out

Well, uranium could be an example. The US doesn't mine much of it anymore - instead, they buy most of what they need from Russia. There's still plenty of it out there, but if you ever stumble across an old mine out West, there'll (hopefully) be a lot of signs warning you not to drink the water or spend much time in the area. There has been a lot of coal and oil extraction, clear-cutting, etc. all around the world. Sometimes because the materials weren't commodities yet, sometimes because it's cheaper to produce locally. But as land and labor get more expensive, so does local production.