Artificial Reefs

http://www.reuters.com/article/2008/05/17/us-subway-reef-idUSN1643767620080517

Old subway cars on the ocean floor serve as artificial reefs and provide protection from (nonhuman) predators for over-fished populations. It's been done elsewhere in the past, and seems to work pretty well. I wonder, though, how this might affect the predators.

While this is a good idea, patchwork like this may also pose the risk of prolonging the kind of action necessary to address over-fishing on the systemic level. It seems, at least, to be a worthy part of the larger solution.