The federal opposition is on the edge of open revolt over a bombshell climate report, with one frontbencher threatening to resign and a Nationals senator likening the report to a biblical apocalyptic screed.

The National Climate Risk Assessment , released on Monday, laid out a catastrophic vision of Australia's future if climate change runs unchecked, unpinning Labor's plan to update its emissions reduction target.

But warnings of a concerning uptick in heat-related deaths and ballooning risks for coastal towns as sea levels rise were brushed off by opposition home affairs spokesman and future Liberal leadership aspirant Andrew Hastie.

The Western Australian MP told ABC radio he was prepared to quit the shadow frontbench or be sacked if the Liberal Party didn't abandon its 2050 net-ze

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