At least $57 billion worth of infrastructure in Victoria is at risk from more frequent and severe bushfires, floods and extreme heat.Melbourne's road and rail networks will incur the greatest costs in infrastructural damage from natural disasters, a new report reveals.The report published by Infrastructure Victoria looked at $318 billion worth of state-owned or regulated public networks and assets It also forecasts how this could look in a "worst case" scenario in 2070.But the report stresses that the financial fallout from these hazards could be mitigated by an array of cost-effective actions and funding measures to safeguard infrastructure now.Natural disasters are not a new phenomenon but their growing frequency and severity challenge the environment and conditions these structures were built to withstand."Our research highlights which assets are most exposed, which climate risks matter most and where risks are concentrated across the state", says Jonathan Spear, Infrastructure Victoria CEO. "It shows where the Victorian government should act now to reduce future damage, service disruption and millions in recovery costs."Overall, the report identified roads, rail, energy infrastructure and health assets as the most vulnerable sectors