I've stocked up on a couple of weeks worth of (cheap) tinned food, in case there's a temporary disruption to food distribution during an avian flu pandemic, and given how frequently there's wars, natural disasters, fuel shortages etc, it seems wise to always have a small caché of tinned food. Perhaps it's because of my lack of any significant bodyfat reserves and my high metabolism that I feel sensitive to food-supply problems, or maybe it's just my pack-rat instincts that give me a warm, fuzzy feeling when I've got a big pile of reasonably non-perishable food, but either way, I'd be rather surprised if I got through my entire life without having some reason to be glad of such a caché.
As for the world actually ending, well, this planet has a good 2 billion + years of habitability left until the sun becomes too large and luminous for anything much beyond extremophiles, and hopefully we'll be well on our way to colonising the rest of the local universe by then. Beyond that, who knows? Maybe we'll all freeze in the heat-death of the universe*, be ripped appart by space-time expansion, or burrow our way to a younger universe*.
*Universe here meaning space-time bubble, of which there may be more than one.
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Banned for discussing the recent spate of bannings.