A conceptual design for a London skyscraper by Paris studio Chartier-Corbasson Architectes proposes using waste generated by workers already in the building to help construct new floors as demand grows. More about Organic Skyscraper by Chartier-Corbasson would be built from office rubbish
A mile-long street provides play space in this conceptual skyscraper by RCA graduate Elly Ward, which examines how children's experience of and contribution to city life can be enhanced (+ slideshow). More about Elly Ward's conceptual tower offers a vision of a child-friendly vertical city
German studio Tammo Prinz Architects has developed a concept for a residential skyscraper built from a stack of modular cubes and dodecahedrons (+ slideshow). More about Tammo Prinz's conceptual skyscraper would be built from tessellating modules
![Synth[e]tech[e]cology by Chang-Yeob Lee](https://static.dezeen.com/uploads/2013/06/dezeen_Synthe-tech-ecology-by-Chang-Yeob-Lee_1sq.jpg)
Royal College of Art graduate Chang-Yeob Lee has developed a concept to transform the BT Tower in London into a pollution-harvesting high rise (+ movie). More about Synth[e]tech[e]cology by Chang-Yeob Lee
Swedish studio Belatchew Arkitekter wants to transform a Stockholm skyscraper into a wind farm by covering it in thousands of electricity-generating bristles. More about Strawscraper by Belatchew Arkitekter
Belgian architect Vincent Callebaut has developed a concept to introduce natural ecosystems into cities with designs for "farmscrapers" made from piles of giant glass pebbles for a site in Shenzhen, China (+ slideshow). More about Asian Cairns by Vincent Callebaut
News: a conceptual proposal for huge buoyant umbrellas that rebuild polar ice caps has been awarded first prize in this year's eVolo Skyscraper Competition. More about Polar ice cap-building umbrella wins eVolo Skyscraper Competition 2013
Algae would produce energy and clean water for a conceptual skyscraper proposed for London by British architect Dave Edwards. More about FSMA Tower by Dave Edwards
This conceptual skyscraper by Brazilian architects Projeto Coletivo would be constructed using rubbish in the city of São Paulo. More about Scrap Skyscraper by Projeto Coletivo
The stark concrete exterior of many of London's postwar housing blocks could be made more attractive with thatching, proposes architecture student James Kirk (+ movie). More about London Thatch by James Kirk
Architecture graduate Stephan Sobl has designed an upside-down skyscraper to hang over the Colorado River in Nevada, right beside the Hoover Dam. More about Vertical Strip by Stephen Sobl