Comment by pjc50

> it's easy to find out the date that oil (petroleum) will run out

No it isn't! This can be estimated, but things can change rapidly. We don't even know when the Strait of Hormuz will reopen, which makes a 5% difference to global production.

Trying to put a precise date on it reminds me of the clergyman who came up with a "precise" date for the creation of the Earth of 4004 BC, by analysing the biblical genealogies.

Nor is it a hard cutoff. Each individual well is like a tap that gradually gets slower and slower, and more and more mixed with water. They are almost always shut off with some oil left in, but exactly how much depends on the oil price at that time.

> a high tech utopia Earth will not be

There are eight billion people on Earth. We're dependent on antibiotics, global food transport, and Haber nitrogen. It's either a high-tech utopia or a much, much smaller number; and we'd better hope that's achieved by falling birth rates and not by one of the other routes.