As far as the end-of-the-world thing goes, I expect that at the end of the world you’ll have plenty of debris around and you won’t need to worry about running out of fuel for campfires. Most of civilization burns pretty good.
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I think solar ovens are a great idea, but my initial skepticism of whether they’re great for everybody is just getting confirmed. There are many things which can go wrong and probably will. If it’s really cold, for example, you can lose as much heat as you gain from the simplest versions.
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With some ingenious arranging of the pole frame from your Coleman tent you create a parabolic mirror from the space blanket, fill your cooking pot with the last of your water and a packet of ramen noodles, and inside of an hour you’ve got food slightly hotter than that sand dune.
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