I instinctively knew BEFORE reading the article there is just no practical way Billions of T-Rex’s could inhabiting at the same time in North America. Of course over 2 or 3 million years that is quite possible.
If humans survive 2 million more years, what will be the cumulative population over that time? Could be beyond the scope of a 64 bit based computer in integer form.
Some years ago I read it’s been estimated 70 billion humans have lived in total. If accurate it means 10% or so of all humans are alive today.