Get this: “The world’s forests have been soaking up a lot of our fossil fuel emissions. That’s because plant photosynthesis absorbs carbon dioxide from the atmosphere. Large disturbances like fire and drought reduce or even reverse that function.”

Rising sea surface and air temperatures have been intensifying the strength and rainfall intensity of monsoons, cyclones and other storm systems, Van Dijk adds. We saw this when Cyclone Jasper battered northern Queensland and severe storms formed in south-east Queensland, leaving a trail of destruction. The cyclone moved much slower than expected, causing torrential rains and widespread flooding.

Enough of that. Australia’s Climate Council, a community funded organisation created by former members of the Climate Commission after it was abolished by the Abbott government in 2013, has created a “heat map” using thousands of data points from the CSIRO and help from the Bureau of Meteorology.

If we assume, perhaps optimistically, that all countries meet their present UN commitments to reduce emissions, the heat map predicts that western Sydney will swelter through twice as many days above 35 degrees and three weeks above 35 degrees every summer. Temperatures will be worsened by the “urban heat-island effect”, as materials such as asphalt and concrete amplify heat by as much as 10 degrees during extreme heat.

Melbourne, too, faces double the number of days above 35 degrees by 2050. Will it take that long for the Australian Open to be moved?

Which brings us to last month, when six transmission line towers in Victoria were destroyed by extreme wind gusts from thunderstorms, leading to about 500,000 people losing power. The intense winds knocked trees onto local power lines or toppled the poles. Some people went without electricity for more than a week.

Loading

A month earlier, severe thunderstorms and wind took out five transmission towers in Western Australia and caused widespread outages. In January 2020, storms caused the collapse of six transmission towers in Victoria.

And, of course, in 2016 all of South Australia lost power for several hours after extreme winds damaged many transmission towers.

Recent research by Dr Andrew Dowdy and Andrew Brown, of the University of Melbourne, suggests that climate change is likely to cause more favourable conditions for thunderstorms with damaging winds, particularly in inland regions. But more research is needed to confirm this.

Van Dijk gets the last word: “Overall, 2023 provided a stark reminder of the consequences of our continued reliance on fossil fuels and the urgent need but apparent inability of humanity to act decisively to cut greenhouse gas emissions.”

Ross Gittins is the economics editor.

The Business Briefing newsletter delivers major stories, exclusive coverage and expert opinion. Sign up to get it every weekday morning.