Inco Superstack vs Turning Torso

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The Inco Superstack in Sudbury, Ontario, with a height of 381 metres (1,250 ft), is the tallest chimney in Canada and the Western hemisphere, and the 2nd tallest freestanding chimney in the world after the GRES-2 Power Station in Kazakhstan. It's also the second tallest freestanding structure of any kind in Canada, behind the CN Tower but forward of First Canadian Place. It's the 40th tallest freestanding structure in the world. The Superstack is situated on top of the biggest nickel smelting operation in the world at Vale's Copper Cliff processing centre in the city of Greater Sudbury.

In 2018, Vale declared that the stack will be decommissioned and dismantled beginning in 2020. On July 28, 2020, Vale declared that the stack had been officially taken out of service, but would remain operational in standby mode for two more months as a backup in case of a malfunction in the new system, after which the dismantling of this Superstack will begin. In addition to further reducing sulfur dioxide emissions by 85 percent, the decommissioning of the pile is expected to cut the complex's natural gas consumption in half.

Source: Wikipedia

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Turning Torso is a neo-futurist residential skyscraper in Sweden and the tallest building in Scandinavia.Located in Malmö on the Swedish side of the Öresund strait, it was built and is owned by Swedish cooperative association HSB. It's seen as the first twisted skyscraper in the world.The project was designed by Spanish architect, structural engineer, sculptor and painter Santiago Calatrava and formally opened on 27 August 2005. The tower reaches a height of 190 metres (623 feet ) with 54 storeys and 147 apartments.In August 2015, it was announced that the building was the winner of the 10 Year Award from the Council on Tall Buildings and Urban Habitat. It won the 2005 Gold Emporis Skyscraper Award.

Source: Wikipedia