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, an organization that represents state environmental regulators, electronics manufacturers and recyclers. In February, the group sent a letter to the Environmental Protection Agency asking for immediate help dealing with the rapidly growing stockpiles of the glass, much of which contains lead.

With so few buyers of the leaded glass from the old monitors and televisions, recyclers have collected payments from states and electronics companies to get rid of the old machines. A small number of recyclers have developed new technology for cleaning the lead from the tube glass, but the bulk of this waste is being stored, sent to landfills or smelters, or disposed of in other ways that experts say are environmentally destructive.

In 2004, recyclers were paid more than $200 a ton to provide glass from these monitors for use in new cathode ray tubes. The same companies now have to pay more than $200 a ton to get anyone to take the glass off their hands.

So instead of recycling the waste, many recyclers have been storing millions of the monitors in warehouses, according to industry officials and experts. The practice is sometimes illegal since there are federal limits on how long a company can house the tubes, which are environmentally dangerous. Each one can include up to eight pounds of lead.