The rain and river water in the city state's reservoirs is being mixed with recycled waste-water from air-conditioners, sinks and toilets.

ECONOMIST: The city state's bid for self-sufficiency

They provide safe havens for ocean wildlife to recover and maintain healthy biodiversity, supporting habitats that act as carbon sinks, removing CO2 from the air and generating the majority of atmospheric oxygen.

CNN: An SOS on World Oceans Day: Save our seas, save ourselves

He's removed cabinets, sinks, the refrigerator and furniture, and he even plans to disconnect his air-conditioning unit and take that, too.

CNN: STORY HIGHLIGHTS