Japan inspired 'water-house' could slash energy needs

Hungary

AS UN climate negotiators gather in Geneva this week, one Japan-inspired Hungarian inventor believes he has found a revolutionary and inexpensive way to construct buildings that could slash humanity's energy needs.

And the magic ingredient for Matyas Gutai's invention is simple: water.

It was launched after a long process of testing and patenting and a decade of research and development at a Japanese university.

"Imagine a building without insulation, yet with a perfect indoo…