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Originally Posted by redpoint5
The "sustainable" zealots live in denial of the fact that nothing in this universe is sustainable. Entropy will have its fancy.
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Eventually, sure, but you know something? I'm not all that worried about what's going to happen in a billion years or so :-)
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One idea I find interesting is that resisting change seems to be in human DNA...
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Not at all true. What you call "resisting change" is really nothing more than people wanting to change things to better suit themselves, instead of you :-)
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Humans aren't content for Earth to be their only habitable place, and this news proves it.
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Proves it how, exactly? Even the ability to travel to other planets (which Orion is far from demonstrating) would not make those planets habitable*. Only intensive terraforming projects, probably taking millenia, could do that.
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One thing is certain; life isn't getting off this planet with a human population of only 500 million.
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Whyever not? Let me just point that the only human voyages beyond low Earth orbit were all done by the US, population (per 1970 census) 203,392,031.
*PS: To be clear, by habitable I mean capable of sustaining a human population indefinitely, without continuously supplying necessities from Earth. You could of course establish long-term bases, in the same way as we have Antarctic research stations, or crews working on ocean oil platforms.