Not so much unintended as just poorly thought out...

Via The Huffington Post:

Low-flow toilets sounded like a good ecoconservative concept. But, because they do not provide enough water to push through waste, there is a stinking build-up of sludge in toilets in San Francisco where they are widely used. Now, the cost for de-stinking the system will run $14 milliion (not to mention the $100 million squandered on setting up the low-flow systems).

This probably ought to be filed with the statistic that about one bird is killed every minute, on the average, by wind turbines.

Cheers...