“With today’s technology, a tower will always be more energy-hungry,” says Philippe Honnorat, head of building services at WSP in the UK. “If you’re going to wash or take a shower on the 80th floor, you have to bring the water up there. When you take your shopping up to your apartment in an elevator, that will consume more energy than if you lived on the ground floor.” Towers also require greater mechanical cooling to remain at a comfortable temperature: “A high-rise building standing out on the skyline effectively becomes a sun capitalisation device, and you can’t just open a window on the 80th storey because there is so much wind.”