Artificial Reef

Environmental concerns
A multi-million-dollar cleanup of Osborne Reef, a tire dump near Fort Lauderdale, Florida is underway. The tires started posing a particular threat after breaking free from the reef and damaging nearby natural reefs.
According to The Ocean Conservancy, a Washington-based environmental group, the Florida reef may be an indication that the benefits of artificial reefs need to be re-examined. Jack Sobel, a senior scientist at the group, has said "There's little evidence that artificial reefs have a net benefit.".