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Green architect and writer, William McDonough, has come good on his promise to to design a speculative tower for the future. The skyscraper will have a 鈥�100% positive impact on people and places鈥�.

Shaped like a cross between the Gherkin and a , the 40-plus story tower by William McDonough + Partners, encompasses trees and other greenery and, so the architect claims, will behave like a tree.

鈥淚t鈥檚 a building that receives its energy from the sun, that grows food, that builds soil, that provides a habitat for hundreds of species, that changes colours with the seasons, that creates micro-climates, that would purify water,鈥� He said. 鈥淎 building that would do just about everything a tree can do except self-replicate.鈥�

The building encloses a series of 鈥渁trium gardens鈥� on the western side with plants intended to clean the air inside the building. The northern side is covered with clear glass in front of mosses which should absorb particulates in the air.

The building recycles waste water for use in the building鈥檚 gardens which, when cleansed by the plants, will be fed back into the grey water system once more.

The south side of the building is made up of 34,000 sq m of solar panels, meeting 40% of the building鈥檚 energy needs. A combined natural gas-fuelled heat-and-power plant, operating at 90% efficiency supplies the missing 60%.

To cut down further on energy, workstations are fitted with presence sensors shutting down when people aren鈥檛 there and adjusting heat, light and sound when they are. 鈥淲e don鈥檛 heat or cool ghosts,鈥� says McDonough, mysteriously.

He and Cradle to Cradle co-author, Michael Braungart, will talk about the tower among other ideas at the which takes place in Abu Dhabi on the 21-23 of January. Lord Foster is due to give the closing speech at the event.

McDonough is credited with creating the first solar powered house in Ireland and received the first and only Presidential Award for Sustainable Development for an individual in 1996.

A spokesperson for the practice confirmed there had been no concrete commissions for the building so far.