Today, the flush toilet probably stands as one of the most unsustainable innovations in human history.
Think about it. Why would we want to increase the liquid volume of a potentially harmful substance – human waste? Most of the waste water that flush toilets create – more than 80% worldwide – ends up going directly back into the environment. No treatment, no use, just a lot of open sewers.
Photo credit: Tom Raftery via Foter.com / CC BY-NC-SA