After my exhaustive ( 5 minute ) investigation on Google, firefly populations worldwide are decreasing. The "usual suspects" toxic chemicals, loss of habitat are a factor as is a more unusual one. Their lighting is part of the mating ritual which can be interfered with by light pollution.
Not really an explanation of the observation of a possible good supply this year, but interesting.
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"You're only young once, but you can be immature forever."
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