How our regions can help make Australia’s growing cities more sustainable

The way we organise our cities and regions creates problems everywhere. We’re facing difficult and polluting drives to work, a lack of affordable housing, and urban designs that lead to car dependency and are bad for our health.

For example, poor levels of walkability are associated with higher rates of obesity, hypertension and cardiovascular disease. Parks and greenery are associated with better mental and cognitive health.

Australian cities sprawl. Many suburbs are hard to get to by public transport or cycling and walking.

Our sprawling cities use a lot of land per person. Their resource use and carbon footprints are massive. They also produce huge amounts of waste.

To resolve such issues, government planners should think beyond our capital cities. Australia needs to develop strategies that connect these capitals with surrounding regional cities to create “megacity regions”.

It’s a settlement model that could work better than our big cities do now, making urban growth more sustainable. The emergence of hybrid work, fast internet and high-speed rail favours this form of settlement.

What are megacity regions?

A megacity region, according to the OECD, is a network of urban areas linked to a capital city by home-to-work commuting. Megacity regions connect these urban centres more efficiently to make them more sustainable and productive.

An early example is the Bos-Wash corridor (including Boston, New York, Philadelphia, Baltimore and Washington DC) in North America that emerged around the mid-20th century. Megacity regions are now common across Europe (for example, Germany’s Rhine-Ruhr region including Dortmund, Essen, Duesseldorf and Cologne, and the Netherlands’ Randstad region including Amsterdam, The Hague, Rotterdam and Utrecht). The Taiheiyō Belt in Japan (including Tokyo, Nagoya, Osaka, Hiroshima and Fukuoka) is one of many Asian examples.

How ready is Australia for megacity regions?

The 2019 CSIRO Australian National Outlook explored the question “What will Australia be like economically, socially and environmentally in 2060?” Its modelling showed “stronger regions” created major benefits across transport, health, education, jobs and housing. One scenario involved 16 million people living in regional Australia by 2060, with 10 million in regional cities.

CSIRO concluded that “investing in the growth of regional satellite cities with strong connectivity to those capitals” creates many opportunities. This growth would benefit the regions while easing pressures on the capitals.

In recent years, the New South Wales government has developed ideas for Sydney to grow into a Six Cities Region from Newcastle to Wollongong.

The Committee for Melbourne has called for an Australian East Coast Megaregion to boost economic growth and attract foreign investment.

In 2023, the Victorian government indicated a statewide strategy, Plan Victoria, would replace Plan Melbourne.

However, without robust regionalisation policies, Melbourne and Sydney are likely to become sprawling megacities of ten million people or more this century. This will add to the strain on transport, infrastructure and housing.

What makes change possible?

Cities and their central business districts are important for their agglomeration effects – the accumulated benefits of concentrated social and economic activity. But this also often leads to social, economic and environmental problems.

Integrating regional cities into the economic life of their capital cities can reduce some of these problems. It can also produce many benefits, including new and more efficient industries, enhanced communication networks and stronger labour markets.

Settlement systems have evolved throughout history. Walking cities became rail-oriented cities, which became car-based cities. All these models in their day supported a daily return commute averaging one hour (Marchetti’s constant).

Our research explores how new technologies and work practices can enable a fourth transition to the megacity region. The drivers of this change include ubiquitous fast internet, hybrid work and high-speed rail.