Funding for hazard reduction burns needs to increase fivefold just to hold the threat to lives and property at current levels, experts warn, saying NSW alone needs to spend $500 million a year.

The state currently spends between $50 million and $100 million annually on burning programs.

Experts warn a new approach to prescribed burns and funding is needed as climate change increases the threat from bushfires to lives and property. Credit:Jeff Darmanin

Bushfire expert Ross Bradstock on Friday said investment needed to jump to half a billion dollars a year in NSW just to keep pace with the increasing bushfire threat. He also warned limiting the focus of reviews into this summer's catastrophe to fuel-load management would not be enough to lower the increasing risk of catastrophic bushfires under climate change.

Prime Minister Scott Morrison on Thursday said a "wide range of factors" would be reviewed after the bushfire crisis, including the contribution of climate change and drought. He highlighted the "many restrictions" placed around "hazard reduction in national parks, dealing with land-clearing laws, zoning laws and planning laws", saying they were issues that needed to be considered "along with many others that we will all have to look at together".