I think opening up a new frontier however, is valuable - in fact specifically, the transition which would be good would be to move heavy industry out of the biosphere entirely. You can imagine a nearer future where a place like Earth is treated as the paradise it is, and the idea of polluting it when we have all the rest of the uninhabitable space of the solar system to do that in is thought of as ludicrous.
And this isn't really unreasonable - beyond a certain point, the resource and energy availability of space is far greater then the places we can reach despite the advantages of the biosphere - whether we do it by robots or with manned exploration.
There's a zeitgeist change that I think would accompany having enough people working frequently in space: where its a couple of degrees of separation from someone who's looked at the pale blue dot and gone "you have no idea how valuable this is" (I do think we should have a program which sponsors any world leader who wants to on a trip around the moon: send the people making the big decisions out past the dark side, where the thing bubble of air, steel and alloy is the only thing keeping them alive - might not always work but at least then we can know they've had the opportunity for that perspective).
Humans definitely can't leave. Humans are even less well suited to interstellar travel than they are to living at the bottom of the ocean, something they also don't do and have no idea how they could ever do.
So, with tremendous effort humans could visit one of their neighbouring planets. All of these planets are terrible. Mars is by far more hostile to life than anywhere humans have even visited, let alone had a permanent settlement. But we could do it. To what end?
Live here, or die here, those are your options and you should get used to it.
To have the species survive if anything ends all life on Earth - apparently not a priority for you but it is for those that enjoy humanity existing.
Also to explore and learn more about the universe we live in. Do you truly not see value in that? Have you never left the city/state/country you were born in?
Nothing the universe has thrown at Earth in the past 3 billion years has been capable of ending all life. And nothing that could happen in the next million years seems possible of doing that either.
It's difficult, but I don't think it is _that_ difficult. Ecologies, like any living systems, can self-heal and regenerate. There are practices that allows us to tap into that regenerative power as societies. They may not happen fast relative to our individual human lifespan, but 50 years is more than enough time to restore wastelands or reverse desertification.
I don't have a good answer to how sustain an economy based upon mining, refining, and manufacturing things out of mineral resources. Many of us have gotten used to modern conveniences (at its own cost related to mental and emotional health, and social cohesiveness). I think what most people balk on are on the perception of having to go back to barely surviving off the land, or having to alter lifestyle. Lifestyle may have to change, but the same regenerative power of ecologies also gives us significantly more resiliency.
Why do anything at all? Who are you to dictate to others what their options are?
I do agree that we should better manage our impact on the only system that we know works.
It's a very unlikely for one, we haven't had an extinction asteroid in 65 million years. Detection and mapping is very good today, and they're relatively simple to deflect given even with current technology, and a long enough lead time. Obsessing about asteroid impact is just an excuse to engage in fantasy.
But saying "We can improve our understanding of ecology by [designing] artificial biosphere", is just the chef's kiss of bullshittery. It's like saying, that we can understand the ocean by getting a fish bowl. Not exactly, and it certainly won't teach us anything about the actual biosphere. Instead, all you'd learn about is atmosphere scrubbers and water reclamation.
and what is this simple method to deflect a large asteroid headed for Earth?
Essentially you have a spacecraft park itself beside an asteroid. It's gravity will minutely change the asteroids trajectory. With enough lead time that's all you need. Since you're not blowing up, or applying a large focused amount of energy to the asteroid it doesn't matter what the targets composition is. You won't break it up.
> This is the lamest of all excuses.
> It's a very unlikely for one, we haven't had an extinction asteroid in 65 million years.
He said "like astroids". Quite frankly we don't know how frequent extinction events happen. We've had nuclear weapons for less than 100 years, and have a couple of close calls[1] already.
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1. https://en.wikipedia.org/wiki/1983_Soviet_nuclear_false_alar...
If you want something that uniquely requires leaving the planet for somewhere you have truck in literally everything except rocks, you’re pretty much limited to the sun becoming a red giant. That and gamma ray bursts. That’s pretty much it.
No. We can't detect asteroids coming from the direction of Sun. Just ask people of Chelyabinsk, Russia. [0]
[0] https://www.livescience.com/space/asteroids/the-sun-is-blind...
[I hope an LLM made it polite enough]
Engage in self harm.
I'd say that such an event happening over a populated region of the Earth would be pretty bad. It's worth a bit of investment.
Here's what would happen if Tunguska happened over Paris, using a mid-range estimate of its magnitude: https://nuclearsecrecy.com/nukemap/?&kt=30000&lat=48.8583&ln...
To be kind of blunt, even an extinction-level asteroid hit with near-total biosphere destruction is probably still more conducive to human life than any other planet or satellite in the solar system, as evidenced by the continued existence of at least a few forms of life past the extinction event. And many of the events people worry about are far less destructive than even that (nuclear winter, for example, would probably roll Earth's climate back to pre-industrial temperatures, maybe as far as Little Ice Age, which is, uh, nowhere near extinction-level threat to humanity).
It's also worth pointing out that it's possible to do closed ecological studies without the expense of running it in space (e.g., Biosphere 2). The only thing you need space for studying in that regard is "what is the effect of non-1g environments on biological forms?" (to which existing studies suggest the answer is somewhere between "bad" and "horrible").
That would be easier if we could move polluting industries off Earth.
As far as cleaning up pollutants themselves, there are some amazing work by Dr John Todd for cleaning up pollution. Two examples of his work — a system capable of breaking down DDT within 40 days. Another where he cleaned up a superfund site that had all ten of EPA’s top toxic pollutant list.