Part of NYC mayor (or, as Gawker so humorously puts it, mayor-for-life) Mike Bloomberg's PlaNYC project is to retrofit old housing and sidewalks with blue and green roofs.
What are blue and green roofs, exactly? You can read about them in this Scientific American article.
The basic idea is that we've got all of these roofs that aren't doing anything right now, so why not make them work for us? Over time, they can save a lot of water and curb greenhouse emissions. Pretty awesome, huh?
Let's not get our hopes up until it gets through Albany, though. The NY state government has a way of killing things slowly, like the MTA, which is having to raise costs and cut services at the same time. Ugh.
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