A newly proposed $650 million waste-to-energy plant in Copenhagen, Denmark is taking facility design to new heights by incorporating a public rooftop ski slope into the design. Bjarke Ingels Group (BIG) has been selected as the winner of an international competition to replace the 40 year old industrial Amagerforbraending plant in Copenhagen. BIG has encouraged an active relationship between the new plant and the public by utilizing vacant roof space as a ski slope. The lift ride to the top of the stack will offer visitors a glimpse into the internal activities of the plant. The ski slope is not the only interesting "new" feature focused on the stack. Every time one ton of fossil CO2 is released, the smokestack will discharge a 30 meter smoke ring into the air as a gentle reminder of the impact of consumption and a measuring stick that will allow the common Copenhagener to grasp the CO2 emission in a straightforward way. After dark, heat tracking lights will continue to illuminate these smoke rings (which are depicted in the rendering to the right.