Urban density goes green with sky-high gardens

To accommodate the planet’s rising population, a focus on urban density means architects are choosing to build upwards instead of outwards. The proliferation of skyscrapers allows us to house more people in a smaller area, which reduces our environmental impact. But why limit this approach to concrete, brick and steel? Forward-thinking design firms are bringing plant life to the skies, with vertical gardens that cling to building exteriors, dangle artistically from balconies, and clean the air around them.