What do you do with the mountain of waste that a major city produces? It is a continuing question, and Copenhagen, the capital of Denmark, has come up with an answer. Ski on it! The waste is inside Copenhill, a waste treatment factory 10 minutes from the center of the city. The main building is a futuristic-looking structure 85 meters high. It includes a long hill from the top of the building to the ground. The hill is covered in a material called “neveplast” creating a snowless ski slope. “I think everybody is surprised to start with when they look at it and it’s not snow,” said Christian Ingels, the director at Copenhill. He said that, after one or two tries on the neveplast hill, “you feel exactly like skiing.” Danish designer Bjarke Ingels designed the place; an important step in Copenhagen’s aim of becoming the world’s first carbon-neutral capital.