Climate advocates are using alarming predictions of heatwave deaths, degraded ecosystems and coastal properties lost to rising seas as ammunition for bold emission cuts through to 2035.

NGOs and federal crossbenchers are among the voices expressing dismay at the long-awaited National Climate Risk Assessment and urging Anthony Albanese's government to step up.

The report details concerning predictions on heatwaves - already the deadliest natural hazard - with an almost 450 per cent rise in heat-related deaths expected in Sydney under 3C of warming.

Average global temperatures have risen 1.3C above pre-industrial levels and are set to hit 2.7C by the end of the century under current policies.

As many as 1.5 million Australians will be at high risk from cyclones, flooding and erosion by 2

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