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My long time issue with the "they would be too intelligent/evolved to have any interest in us" type scenario, such as he puts as number two here, is that we go through great lengths to try and research and understand very primitive life. There are efforts being made to talk to dolphins and apes. We're looking to build ships to crash or land ships onto Titan to see if there is microbial life on a moon orbiting a gas giant, not to mention work to see if Mars once upon had life. So the very fact we're able to get off our little rock (though not much off it), I think would warrant a stop and look, perhaps to help answer what was life like at such an early stage of evolution.

Not said stop and look doesn't imply any sort of communications. Indeed there may be a Prime Directive like thing with them where by they see and observe, but leave no evidence of such a visit (alien abductions being just mental illness coupled with abuse or other issues).

Now distance is a super valid point, but by far the most likely point is the survivability window, which he talks about in point three. We're still a level zero civilization (Kardashev scale) and decades until we reach a level one civilization (unfortunately it seems delayed even further due to some very anti-science moves being made by certain groups). Moving up that scale is only one thing, avoiding killing ourselves via war is another huge one. With CRISPR technology advancing, there is a very real danger of a Division/Stand/Utopia type disease coming to the foreground, especially if driven by a zealot (ala Division and Utopia). I highly doubt a man made black hole or something, but war or a CRISPR engineered disease... Not to mention the natural disasters he mentioned, and others, such as huge gamma ray bursts and others that we've managed to avoid. And we'd have to think that most civilizations go through somewhat similar phases, with a universe that is fairly hostile to life, even if many planets are capable of at least starting life. Generally I figure that most civilizations never make it past the stage we are at now, and those that do probably don't get to stage two and beyond (to be fair, I doubt any civilization can achieve stage two on Kardashev's scale as it goes beyond knowledge needed, but materials and more).

Back to the technology of communications point. I've generally figured if you are space faring, you gave up on radio communications and are using strange properties or something along those lines.

Tags for this video have been changed from 'TEDx, TEDxVancouver' to 'TEDx, TEDxVancouver, blomkamp, kurzweil, civilization, kardashev scale' - edited by gwiz665