Inco Superstack vs Q1 Tower

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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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Q1 Tower (an abbreviation of Queensland Number One) is a 322.5-metre (1,058 feet ) skyscraper in Surfers Paradise, Queensland, Australia. The residential tower on the Gold Coast has been the world's tallest residential building from 2005 to 2011. As of 2020 it is the ninth-tallest residential tower in the world and is the tallest building in Australia and the Southern Hemisphere, and the second-tallest freestanding construction in the Southern Hemisphere, behind the Sky Tower in Auckland, New Zealand. The Q1 formally opened in November 2005. The landmark building was recognised as one of Queensland's icons during the state's 150th-birthday celebrations.

Source: Wikipedia