Fireflies are disappearing. Here’s why — and what you can do to help.

Fireflies were a source of great pleasure when I was kid. My friends and I would chase them through our yards on summer nights, catching them in our palms and delicately moving them to mason jars, where they’d light up our bedrooms. But now, fireflies are disappearing on a much larger scale. For years scientists have “been warning that the world’s estimated 2,000 species...

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