Inco Superstack vs Sapphire of Istanbul

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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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Istanbul Sapphire, or Sapphire, is a skyscraper located in the central business district of Levent in Istanbul, Turkey.

It was Istanbul's and Turkey's tallest skyscraper between 2010 and 2016, and the 4th tallest building in Europe when its construction was finished in 2010. Sapphire rises 54 floors above ground level, and contains an above-ground roof height of 238 meters: the construction has an overall structural height of 261 meters including its spire, which is part of the design rather than a radio antenna. Designed by Tabanl?o?lu Architects, it's a luxury and shopping residence mixed-use development managed by Kiler GYO. It's also the nation's first ecological skyscraper. As of 2020, Istanbul Sapphire is the 4th tallest skyscraper in Istanbul and Turkey, behind Metropol Istanbul Tower 1 (70 flooring / 301 metres including its twin spires) from the Ata?ehir district on the Asian side of the city; and the Skyland Istanbul Towers 1 and 2 (2 x 70 flooring / 293 metres), located adjacent to Türk Telekom Stadium at the Seyrantepe quarter of the Sar?yer district, on the European side.

Source: Wikipedia