[dsign]

> Can we achieve prosperity without economic growth?

It's extremely difficult. Progress is almost always related to new products and services. Imagine developing those under the constraint of no economic growth. "We can't grow economically, so we can't develop this new vaccine unless we close all the coffee shops in town."

> Because at a point, we sure can't have prosperity with continuous population growth.

That's a different thing. In theory, one can have economic growth without population growth, at least for a time and in certain range. The economists call it "productivity"[1]; it measures how big is the lever that each worker uses to produce. I guess that we could, with the current population of Earth, have sustained economic growth without population growth for centuries, just by equalizing-up productivity across all population sectors and countries.

With that said, even the current human population of Earth is quite a stress on the planet. In the best world, we would find more and better places to live, so that we can leave our planet be and have the freedom to have families as big or small as we like.

[1]: https://en.wikipedia.org/wiki/Productivity