I am very suspicious of attempts to change the world that can’t first work on a local scale. If after decades we can’t improve quality of life in places where the tech élite actually lives, why would we possibly make life better anywhere else? We should not listen to people who promise to make Mars safe for human habitation, until we have seen them make Oakland safe for human habitation. We should be skeptical of promises to revolutionize transportation from people who can’t fix BART, or have never taken BART. And if Google offers to make us immortal, we should check first to make sure we’ll have someplace to live.