So many things get mentioned, but let's see what readers here are worried about. I hope I've covered the main sources of worry. We'll revisit in 48 hours to see what people are afraid of.
UPDATE: A couple of readers note the absence of climate change from the list, which was an error of omission. I don't think it's the most serious issue, but I wish I had remembered to include it. I'll open a discussion of the results on Wednesday, so readers can mention other omissions.
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