A question for all.
Hypothetical question: If the human race disappeared from the earth today, how long would it take for all traces of civilization to disappear? How long would it take our infrastructure to crumble to dust? This occurred to me as I was on my walk today, and noticed how much the sidewalks were beginning to break up. They’re only 40 years old. With no one around to repair, or replace, things will just disintegrate.