Four decades later, Florida now considers removing up to 2 million tires

FORT LAUDERDALE, Fla. - A mile offshore from this city's high-rise condos and spring-break bars lie as many as 2 million old tires, strewn across the ocean floor a white-walled, steel-belted monument to good intentions gone awry.

The tires were unloaded there in 1972 to create an artificial reef that could attract a rich variety of marine life, and to free up space in clogged landfills. But decades later, the idea has proved a huge ecological blunder.