Norman Foster: I would say that we’re seeing all the kind of advance signals of mobility that will be much more seamless, that will be quieter, that will be cleaner, that has the potential to reduce pollution, to increase greenery in cities. If you take the revolution around transport — and it’s no longer fossil fuel-based, it’s electric — then you’re not going to have the byproducts, which are fertilizers. If you don’t have fertilizers and you have a water issue, which is also on the horizon, you have to call into question why agriculture is out there in the middle of nowhere. Because if you put it where you’ve got natural fertilizer as in sewage, and water as in waste, and you can reprocess that, recycle it, and you can use hydroponics, then your kind of garden agriculture of the future, which currently consumes a huge amount of energy and contributes to greenhouse gases, starts to come to the city. The city needs less tarmac if you follow the revolution in transport, artificial intelligence, and robotics. And if you look at surfaces — which at the moment we’re retrofitting with solar cells — if you imagine that those surfaces — that the conversion to energy is embedded in them and that you’re not retrofitting panels on top of an existing building, but the walls that you’re putting up there are going to convert light into energy, then you have, I think, some very, very exciting prospects.  And cities that are more friendly, dense, less dependent on sprawl — the more compact cities, which are pedestrian friendly. London is a very good example. Manhattan is an extreme example. I mean very positive in terms of the way most people walk to work, high-quality public transport. But multiply all that with a much increased standard of mobility.