Callaway Climate Insights

Callaway Climate Insights

The scariest part of Halloween for climate advocates

The environmental impact of this holiday trick could haunt us for centuries

Mark Hulbert's avatar
Mark Hulbert
Oct 14, 2026
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This 1970 Walt Kelly cartoon is an iconic reference point for the environmental and climate change movements. Image: Walt Kelly.

(Mark Hulbert, an author and longtime investment columnist, is the founder of the Hulbert Financial Digest; his Hulbert Ratings audits investment newsletter returns.)

CHAPEL HILL, N.C. (Callaway Climate Insights) — Keep the climate in mind as you decide what your Halloween costume will be this year.

That’s because the scariest part of Halloween may be what happens on the day after: That’s when an estimated 35 million costumes will be thrown in the dump, most having been worn only once. The vast majority of these costumes are woven from synthetic fibers derived from fossil fuels.

Though these Halloween costumes will see the light of day for just a few hours, their environmental impact will be felt for decades — if not centuries.

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