Inco Superstack vs First Canadian Place

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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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First Canadian Place (originally First Bank Building) is a skyscraper in the Financial District of Toronto, Ontario, in the northwest corner of King and Bay streets, and serves as the global operational headquarters of the Bank of Montreal.

At 298 m (978 ft), it is Canada's tallest skyscraper and the 15th tallest building in North America to structural top (spires) and 9th highest to the roof top, and the 105th tallest in the world. It's the third tallest freestanding construction in Canada, after the CN Tower (also in Toronto) and the Inco Superstack chimney in Sudbury, Ontario. The building is owned by Brookfield Office Properties, setting it in co-ownership with the neighbouring Exchange Tower and Bay Adelaide Centre as well as various other office areas across Downtown Toronto.

Source: Wikipedia