‘Roots in the Sky’, shown below, is a current scheme led by investment manager and developer Fabrix. It describes itself an ‘urban forest’. It features a 1.1 acre rooftop forest of over 100 established trees, 10,000 plants and over 1300 tonnes of soil. Designed by award-winning architects Studio RHE, and granted planning by London Borough of Southwark. Image credit to Studio RHE.