Questions

What information may be derived from the assumption that civilization(s) continue for millions of generations? Such information should help us better understand the conditions required for civilization to exist on this planet while the sun provides a suitable environment.

Let us try to avoid predictions or speculations. The assumption may not allow valid conclusions for certain topics. We should try to find questions where it does and focus exclusively on those. Additional assumptions may be helpful later to answer additional questions. Implicit assumptions are hard to avoid but should be declared when recognized. Keeping the assumptions to a minimum will increase relevance. All this may be difficult and the rules should not hinder progress. Let us try without fear, and improve where we can later.

Let us not (here) think about how (or if) we believe the assumption that civilization(s) continue for millions of generations can or should be reached. Those discussions could come later or take place elsewhere.

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If a civilization continues for millions of generations...

What would its average rate of population growth be?

How much of the resources can each generation consume?

How would such civilizations satisfy the need for energy?

How many individuals could there be on earth?

It managed to keep the population from falling below critical limits and from rising above critical limits (if any). What can we learn from that?

What threats did it have to survive? What information can be gained from the fact that it did survive the various threats?

Which threats may exist that are beyond control of any civilization?

How much would its average economic growth be?

Could it keep on increasing its knowledge?

How much could entropy rise per generation?

What does sustainable mean for civilizations that continue for millions of generations?

Could different civilizations coexist on this planet for millions of generations?

Could a civilization be replaced by another?

please add questions ...