The total annual cost of natural disasters in Australia is expected to more than treble to $33 billion by 2050, according to new research.

Natural disasters cost Australia more than $9 billion, or about 0.6 per cent of GDP, in 2015, according to financial services company Deloitte. But when the impact of mental health issues, family violence, chronic disease and alcohol misuse is factored in, the bill is predicted to balloon by more than…