Climate risks must be factored into workplace health and safety, unions and emergency personnel say. Photo: Dean Lewins/AAP PHOTOS

Extreme heat, flash floods and airborne diseases could all strike down Australian workers in huge numbers if climate change is not factored into workplace protections, a top union official warns.

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Trillions of dollars and millions of workdays will also be lost in a climate-impacted future if safety laws do not keep pace with the warming planet, a report says.

A coalition of firefighters, nurses, teachers and union officials gathered in Parliament House o

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