Construction is underway in Seattle on a futuristic zero-waste apartment building, intended to host a range of green initiatives including the recycling of waste water.
The five-story Bullitt Centre is aiming to be the greenest commercial building in the world, inspired by the Living Building Challenge, which is described as "a philosophy, advocacy tool and certification program that promotes the most advanced measurement of sustainability in the built environment possible today".
Designers and engineers are currently hard at work trying to persuade the US Environmental Protection Agency (EPA) that treating all water used onsite could be the answer to drive energy and water waste downward.
Engineering consultants discovered that waste from marine toilets could be turned into safe drinking water once transported to a basement composting room.
Unsurprisingly, the EPA is wary about the idea.