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|Temperature check: greening Australia's warming cities||5.61 MB|
Heatwaves are particularly troublesome in cities, because cities are typically hotter than the surrounding countryside. Australia is the most urbanised nation on earth, with 60% of the population living in cities of one million people or more, which places our communities at significant risk of heat-related impacts.
One important way we can cool our cities and reduce the risk and severity of heatwaves, is by revegetating our urban areas. Not only is expanding our urban vegetation good for reducing heat-related deaths, but it can create jobs (helping with COVID-19 economic recovery), provide habitat for our native wildlife, and help address climate change by absorbing more carbon dioxide from the air.
This report presents evidence that strong action to increase urban vegetation will become imperative in our three largest cities to reduce serious heatwave impacts by 2060–2080, even with strong climate action. Without strong climate action — and continuing business-as-usual — Brisbane, Melbourne and Sydney will regularly experience temperatures above recommended health thresholds. Green infrastructure (like planting native trees and plants) takes time to establish to its maximum effectiveness, so acting early is critical for meeting future needs. This study also finds that local areas more vulnerable to additional city heat are typically more disadvantaged suburbs with lower levels of protective vegetation cover.