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If for any reason at least 50% of the sunlight currently available gets blocked for a significant amount of time (such that traditional agriculture would be rendered useless), this market resolves as Yes.
If some sunlight will be blocked, but not in a globally significant way, the market resolves as No.
Edit: It has to qualify as an existential catastrophe to resolve as Yes.
@RobertCousineau The first three are all the significant causes I'm aware of, but I wouldn't include the fourth one, because ig this wouldn't be done in a way that causes an existential catastrophe for humanity (if it does, though, I would count it).
@MustaphaMondo I'd amend your resolution criteria then to be clear it must be an existential catastrophe then - my transhuman dreams often involve traditional agriculture being unnecessary (atleast for a large portion of the earth).
@RobertCousineau I've edited it to be clearer. If agriculture would cease to be necessary for (post)humans, this wouldn't resolve as Yes (let's say N/A it that case).