Traffic jams. Housing costs. Packed beaches. High-rise living. The pace and general stress of life.

Many of Sydney people’s everyday concerns can be linked in some way to population growth. What if we could just turn it off, and keep a stable population of around five million?

It might surprise you to learn it would be relatively easy for Sydney to cut its population growth to near zero. It wouldn’t take an onerous “one-child” policy like China’s. All we’d have to do is turn off the tap of foreign immigration, to a net in-take of zero, and almost overnight the city’s population would plateau, staying basically flat right out to 2036.

At least, that’s what modelling done by the state Department of Planning and Environment in 2016 showed.

The department, which expects the city’s population to reach 6.4 million by 2036, said that the population would actually stagnate at beneath five million without any immigration (we have since already passed five million). Their projection takes into account both the loss of immigrants expected to arrive, and the babies they would be expected to have.