Editing Skyscraper (section)

===Wooden skyscrapers===
{{Main|List of tallest wooden buildings}}
[[File:Ascent MKE completed.jpg|thumb|The 25-story [[Ascent MKE]] is the world highest mass timber structure.<ref>{{cite news |title=World's tallest timber building opens |url=https://www.fs.usda.gov/inside-fs/delivering-mission/apply/worlds-tallest-timber-building-opens |agency=Forest Service |publisher=United States Department of Agriculture}}</ref>]]
Several wooden skyscraper designs have been designed and built. A 14-story housing project in [[Bergen|Bergen, Norway]] known as 'Treet' or 'The Tree' became the world's tallest wooden apartment block when it was completed in late 2015.<ref>{{Cite news|url=https://www.reuters.com/article/us-construction-environment/wooden-plyscrapers-challenge-concrete-and-steel-idUSKBN1611U5|title=Wooden 'plyscrapers' challenge concrete and steel|work=U.S. Reuters|access-date=22 March 2018|language=en-US}}</ref> The Tree's record was eclipsed by [[Brock Commons Tallwood House|Brock Commons]], an 18-story wooden [[dormitory]] at the [[University of British Columbia]] in [[Canada]], when it was completed in September 2016.<ref>{{cite news|url=http://www.architectmagazine.com/technology/the-university-of-british-columbias-brock-commons-takes-the-title-of-tallest-wood-tower_o|title=The University of British Columbia's Brock Commons Takes the Title of Tallest Wood Tower|date=16 September 2016|newspaper=Architect|access-date=10 December 2016}}</ref>

A 40-story residential building 'Trätoppen' has been proposed by architect Anders Berensson to be built in [[Stockholm|Stockholm, Sweden]].<ref>{{cite web |url=https://www.dezeen.com/2016/04/25/anders-berensson-architects-tratoppen-wooden-skyscraper-concept-stockholm-cross-laminated-timber/|title=Anders Berensson proposes wooden skyscraper for Stockholm|date=25 April 2016|website=Dezeen|access-date=10 December 2016}}</ref> Trätoppen would be the tallest building in Stockholm, though there are no immediate plans to begin construction.<ref>{{Cite web|url=https://www.designingbuildings.co.uk/wiki/Tratoppen,_Stockholm|title=Tratoppen, Stockholm - Designing Buildings Wiki|website=designingbuildings.co.uk|language=en|access-date=22 March 2018}}</ref> The tallest currently-planned wooden skyscraper is the 70-story [[W350 Project]] in Tokyo, to be built by the Japanese wood products company Sumitomo Forestry Co. to celebrate its 350th anniversary in 2041.<ref name=":1">{{Cite web|url=https://www.theguardian.com/cities/2018/feb/16/plyscraper-city-tokyo-tower-wood-w350|title=Plyscraper city: Tokyo to build 350m tower made of wood|last=Hunt|first=Elle|date=16 February 2018|website=The Guardian|language=en|access-date=22 March 2018}}</ref> An 80-story wooden skyscraper, the River Beech Tower, has been proposed by a team including architects [[Perkins + Will]] and the [[University of Cambridge]]. The River Beech Tower, on the banks of the [[Chicago River]] in [[Chicago|Chicago, Illinois]], would be 348 feet shorter than the W350 Project despite having 10 more storys.<ref>{{Cite news|url=https://www.archdaily.com/796649/the-tallest-timber-tower-yet-perkins-plus-wills-concept-proposal-for-river-beech-tower|title=The Tallest Timber Tower Yet: Perkins + Will's Concept Proposal for River Beech Tower|date=6 October 2016|work=ArchDaily|access-date=22 March 2018|language=en-US}}</ref><ref name=":1" />

Wooden skyscrapers are estimated to be around a quarter of the weight of an equivalent [[Reinforced concrete|reinforced-concrete]] structure as well as reducing the building carbon footprint by 60–75%. Buildings have been designed using [[Cross laminated timber|cross-laminated timber]] (CLT) which gives a higher rigidity and strength to wooden structures.<ref name=":0">{{cite news|url=https://www.economist.com/news/science-and-technology/21706492-case-wooden-skyscrapers-not-barking-top-tree|title=Building materials: Top of the tree|newspaper=The Economist|date=10 September 2016|access-date=10 December 2016}}</ref> CLT panels are prefabricated and can therefore save on building time.<ref>{{cite web|url=http://www.seattlemag.com/are-high-rise-wood-buildings-seattles-future|title=Are High-Rise Wood Buildings in Seattle's Future? |website=Seattle Business Magazine|date=15 September 2016 |access-date=10 December 2016}}</ref>