Ken Yeang's "bio-climatic" office buildings provide an energy-efficient alternative to traditional towers by taking into account tropical conditions.

CNN: SPECIAL REPORT CITIES

Architect Ken Yeang is the world's leading green skyscraper architect and a passionate advocate of what is already being called "vegitecture".

CNN: Green walls: the growing success of 'vegitecture'

Yeang has even talked in terms of future plans for "vertical farms" where residents could grow and harvest their food from the walls of their homes.

CNN: Green walls: the growing success of 'vegitecture'