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As recently as a few years ago, broken monitors and televisions like those piled in the warehouse were being recycled profitably. The big, glassy funnels inside these machines — known as cathode ray tubes, or CRTs — were melted down and turned into new ones.

But flat-screen technology has made those monitors and televisions obsolete, decimating the demand for the recycled tube glass used in them and creating what industry experts call a “glass tsunami” as stockpiles of the useless material accumulate across the country.

The predicament has highlighted how small changes in the marketplace can suddenly transform a product into a liability and demonstrates the difficulties that federal and state environmental regulators face in keeping up with these rapid shifts.

“Lots of smaller recyclers are in over their heads, and the risk that they might abandon their stockpiles is very real,” said Jason Linnell of the Electronics Recycling Coordination Clearinghouse,

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Cathode ray tubes have been largely replaced by flat panels that use fluorescent lights with highly toxic mercury in them, said Jim Puckett, director of Basel Action Network, an environmental advocacy group. Used panel screens from LCD televisions and monitors, for example, do not have much recycling value, so many recyclers are sending them to landfills.