Waste-to-energy Power Plant Facility, Copenhagen, Denmark

Lifts will run alongside the stack to transport skiers to the top of the building, with the journey up affording passengers a view inside the plant.
Berlin-based studio realities: united have designed the smokestack as an installation named BIG VORTEX. Described as "a gentle reminder of the residues of waste burning" the chimney will gently blow clouds in the shape of smoke rings. It is claimed each ring, approximately 30 metres in diameter and 3 metres in height, will constitute exactly one ton of fossil carbon dioxide. At night the smoke rings will be lit up by heat-tracking lasers able to project a pie-chart onto the smoke that displays a quota of fossil-fuel CO2. Located in an industrial area on the outskirts of the city, the building, planned for waste-to-energy company Amagerforbraending, is the single largest environmental initiative in Denmark, with a budget of £400m.