evidence: The conditions have sparked concerns over damage from erosion, with Waverley Council Mayor Paula Masselos warning the state's entire coastline has been affected. [...] And it's not just in NSW. Rising sea levels are posing a risk for properties all across Australia — now and many decades into the future. [...] For example, last year construction began on a controversial 1.3-metre sea wall from Collaroy to South Narrabeen in Sydney's north, designed to prevent future erosion threatening beachfront homes.