Quote:Any advanced civilization is going to be manufacturing things out of metals and plastics etc that will be around for a long time after they are gone.
Now here's another assumption. Just because it's what we do, it doesn't mean that it's the only way to go.
We're consumption junkies. Considering what is a good and healthy way for a human to live out it's life, this could be called a dysfunction. No need to assume it has happened before. After all, as you say, there's no evidence for it.