Heat deaths will increase more than 400 per cent in Sydney and will nearly triple in Melbourne at three degrees of global warming according to the first National Climate Risk Assessment report, released by the federal government on Monday.

The report finds that all Australians are already being hit by the impacts of climate change, which will increase over the coming years as temperatures rise, creating what the report calls compounding and cascading risks to all elements of Australian life.

The report lays out the expected impacts at 1.5, 2 and 3 degrees of warming, and emphasises that the outcomes it describes are not inevitable, but what the authors expect to happen if Australia fails to either reduce warming or thoroughly prepare for its impacts. The world has already warmed by 1.2 d

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