Australians have been warned of skyrocketing heat-related deaths and plummeting property values from global warming, as the federal government prepares updated goals to cut emissions.

The long-delayed National Climate Risk Assessment contains alarming details, including an expected 444 per cent rise in heat-related deaths in Sydney under 3C of warming.

As many as three million Australians would be at high risk from cyclones, flooding and erosion by 2090, reflecting densely packed populations living along coastlines.

Losses in Australian property values could balloon to $770 billion by 2090 if little effort was made to adapt and relocate to lower-risk locations.

Average global temperatures have already risen 1.3C above pre-industrial levels and are set to hit 2.7C under current poli

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