Copenhill, a new artificial ski slope built on the roof of a huge waste incinerator here, was opened to the public on Friday.Photo taken on Aug. 16, 2019 shows the Amager Bakke Incinerator Plant in Copenhagen, Denmark. (photo: Xinhua)

Architects from Bjarke Ingels Group, a group which designed Copenhill, said there will be no unpleasant smells either inside the factory or on the roof.Photo taken on Aug. 16, 2019 shows the main chimney of Amager Bakke Incinerator Plant in Copenhagen, Denmark. (photo: Xinhua)

Photo taken on Aug. 16, 2019 shows a view from the top of the ski slope of Copenhill in Copenhagen, Denmark.(photo: Xinhua)

While the public can whizz down the 450-meter ski slope, up to 450,000 tonnes of waste will continue to be converted annually into heat and electricity in Amager Bakke Incinerator Plant underneath skiing guests' feet. (photo: www.designboom.com)