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> The odds we live to see an asteroid hit us are slim.

Presumably this is based on a belief that humans are likely to go extinct. I don't agree; I think we're extremely unlikely to go extinct and, following from this, an impact is definitely something worth worrying about.

It doesn't even have to be a "planet-killer," a smallish impactor could wipe out a city.

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The question is really how likely are we to be hit within the relevant time period. Had we taken a slower growth curve, we'd avoid climate change at the cost of an extra 50 or 100 years before being able to divert asteroids. That seems like a good bet. I am much more worried about climate change and irreversible destruction of ecosystems than getting hit with an asteroid in a very limited time period

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