Inco Superstack vs Tokyo Sky Tree

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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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Tokyo Skytree (????????, T?ky? Sukaitsur?, stylized TOKYO SKYTREE) is a broadcasting and monitoring tower in Sumida, Tokyo. It became the tallest construction in Japan in 2010 and reached its full height of 634.0 meters (2,080 ft) in March 2011, making it the tallest tower in the world, displacing the Canton Tower, and the second tallest structure on earth following the Burj Khalifa (829.8 m/2,722 ft).The tower is your primary television and radio broadcast website for the Kant? region; the elderly Tokyo Tower no longer provides complete digital terrestrial television broadcasting protection because it is surrounded by high-rise buildings. Skytree was completed on Leap Day, 29 February 2012, with the tower opening to the public on 22 May 2012. The tower is the centrepiece of a large business development financed by Tobu Railway (which owns the complex) and a group of six terrestrial broadcasters led by NHK. Trains stop at the adjacent Tokyo Skytree Station and nearby Oshiage Station. The complex is 7 km (4.3 mi) north-east of Tokyo Station.

Source: Wikipedia