Inco Superstack vs Ocean Heights

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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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Ocean Heights is a supertall residential skyscraper in Dubai Marina, Dubai, UAE.

The tower stands 310 m (1,017 feet ) tall with 83 floors. The tower is designed by Andrew Bromberg of Aedas. The building was topped out on 22 December 2009, and completed in 2010. Currently Ocean Heights is the fifth-tallest residential construction in the world, and fourth-tallest residential construction in Dubai, behind The Marina Torch, and HHHR Tower. The tower, with its unique curves and twisting motion as one ascends, is actually the third version of the tower proposed by DAMAC Properties Co.. The first version had the tower in a significantly briefer 38 floors, the next had 50. The 83-floor tower houses more than 519 condos and is located along Al Sufouh Road in Dubai Marina.

Source: Wikipedia