A rendering of a planned Norwegian hotel, Svart, which will be located at the foot of the Svartisen glacier on Norway'sHelgeland coastline. (Snøhetta/Plompmozes) At a Glance Planners for a proposed Norwegian hotel hope to build the world's first energy-positive "powerhouse" hotel by 2021.The circular 'Svart' will be located at the foot of the Svartisen glacier on Norway'sHelgeland coastline. A design group in Norway hopes to build the world's first energy-positive "powerhouse" hotel by 2021. If plans go accordingly, "Svart" will...