This is a pretty good description of the Kardashev Scale of civilization energy usage.
I initially thought the video overestimated how close we are to being a Type I civilization, but then I remembered that the whole scale is logarithmic, so maybe not.
It also mentioned that we might “choose” to build a megastructure like a Dyson swarm. That makes it sound like maybe a central committee might decide it’s a good idea. It seems more likely that people will eventually start putting energy collection stations in orbit around the sun, and that over time these stations proliferate until most of the energy of the sun is being captured.
Kardashev himself stopped at Type III, believing that Type IV and higher wasn’t possible. I actually think a Type IV itself may be possible, but going higher seems dubious under the laws of physics as we currently understand them. As the video mentions, a Type Omega might seem indistinguishable from God.
The video mentions toward the end that we can’t rule out that as we become more advanced, the idea of these expansions might become obsolete. It seems likely that we will eventually be modifying ourselves. It may be far cheaper in terms of energy usage to modify ourselves to use the available energy more efficiently than to keep expanding until we’re using the energy of an entire galaxy, or more. It might be that the most advanced civilizations take this path, eschew expansion, turn inward, and close themselves off into virtual heavens.
Except, we’ve never been a species that acts with any kind of unanimity. Even if large portions of humanity decided to take the inward path, it doesn’t seem likely all of us would. When we expand the scope to every civilization that might arise, the probability that all of them choose the inward path seems even less likely.
But as the video mentions, we don’t see evidence for Type III civilizations anywhere near us. Years ago, I shared the results of a study that looked for Type III civilizations in 100,000 galaxies. It found 50 possibilities, which doesn’t sound like much, but might be a realistic proportion, although the evidence sounded pretty limited, even for those 50.
From what I’ve read, Type II civilization should also be detectable, as odd sources of infrared radiation with limited visible light, or by other means. I don’t know if there’s been any comprehensive attempt to discover these. Occasionally there have been false alarms (such as “Tabby’s star”), but they’ve all turned out to be explainable in natural terms.
And, as I’ve mentioned several times, unless interstellar travel is impossible, it seems like if there were any number of other civilizations out there, at least some of them should have reached us by now. Actually they should have been here long before we evolved. But if intelligent civilization producing life is very rare, if there are only 50 per 100,000 galaxies, which I think is likely, then we’re seeing the results we should expect.
Unless of course I’m missing something?