gut;980263 wrote:So are you banking on man-made or natural extinction event? Or that we stop reproducing and just clone/grow new bodies when we wear these out?
As for extinction events, I think there's a good chance we'll have the technology to overcome it. Obviously we couldn't do anything about an asteroid hitting tomorrow, but 1000 years or even 100 years from now?
I didn't see this until now, but I would say a natural extinction event is far more likely.
I'm not saying it's going to happen in 20 years, or even 20,000 years. But the earth is only 4.6ish billion years old right now. You think human beings are going to make it more than twice as long as they solar system has been in existence?
There are 5 accepted mass extinction events in the last 500 million years. Only 1/10th the time that it will/would probably take for the sun to expand and destroy the planet assuming the earth itself hasn't been destroyed by that point.
Also, if you buy into evolution it's likely that homo sapiens will evolve by that point anyway, rendering this all moot. You don't see many homo habilis or neanderthals around today. And I know we're smarter and more advanced than those species, but that doesn't make you any less susceptible to drought, disease, asteroids, new and more complex species, etc.
The technology to colonize other worlds may exist in the near future, but there's a difference between setting up a colony on a planet and finding one to support an entire population in the billions and growing, not to mention the plant/animal life that would be needed to accompany us for survival.