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Japan inspired 'water-house' could slash energy needs

Water absorbs heat during hot spells and distributes it during cold snaps

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The walls of Mr Gutai's house are made of glass panels - with a gap in between like double glazing - filled with water.

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