Yes, I get it, beating on the US is a fun thing to do, especially right now. But if you think there's anything particularly wicked or decadent about Americans by nature, then you're no different than the countless racist despots that have caused untold human misery through the ages. Every time someone makes an assumption that another group of people is somehow more evil by nature, that assumption has been proven wrong again and again. People are just people.
What you're missing is that while the US does currently use an outsized amount of resources, we only do so because we are wealthy. If tomorrow everyone in the US dropped dead, the cost of various resources would decline, but all those resources would still be used. Sure a more globally equitable distribution of resources would be a good thing, but it won't do anything to help humanity's total environmental impact.
Earth has 8 billion people on it. The poorest 7 billion are scraping and scratching as hard as they can to live the same lifestyle as the richest 1 billion.