悉尼西区马斯登公园等新开发社区的规划设计存在严重缺陷，采用深色屋顶、黑色沥青路面和缺乏树木绿化等做法，正在加剧城市热岛效应。[1]该地区曾在夏季热浪期间成为地球上最热的地方。[1]新南威尔士州财政部估算，极端天气灾害的年均成本将从2020-21年的51亿澳元增至2060-61年的158亿澳元，2070年州经济将缩小7000亿澳元。[1]
尽管新南威尔士州政府制定了浅色屋顶和绿化规划目标，即在10年内将树冠覆盖率从21.9%提升至40%，但西悉尼许多郊区由于私人地产缺乏树木而难以突破个位数的覆盖率。[1]面对住房危机与气候风险的双重压力，政府在关键领域投入仍显不足。[1]马斯登公园北部原计划6200户的重新规划已缩减至960户，韦斯特肖菲尔兹则从4500户缩至2900户，此举引发了紧急服务前任专员的反对。[1]
洪泛风险也成为重大隐患。[1]霍克斯伯里-内皮安洪泛平原在概率最大洪水情景下需疏散23.4万人，保险理事会呼吁联邦和州政府在10年内提供301.5亿澳元用于洪泛防御基金。[1]重建局已完成826次买回（计划1000次），但韧性土地项目至今未交付任何住宅用地。[1]
Newly developed communities in western Sydney, including Marsden Park, are being constructed with design features that intensify the urban heat island effect. [1] The suburbs feature dark-colored roofs, black asphalt roads, and minimal tree coverage—environmental characteristics that exacerbate heat absorption and storage. [1] During summer heat waves, western Sydney has recorded some of the hottest temperatures on Earth. [1]
The New South Wales government has introduced targets for lighter-colored roofs and increased green coverage, yet implementation remains inadequate across critical areas. [1] The state aims to lift tree canopy coverage from 21.9% to 40% within ten years, but many western Sydney suburbs struggle to exceed single-digit percentages due to the absence of vegetation on privately owned land. [1] Meanwhile, the NSW Treasury estimates that extreme weather disaster costs averaged AU$5.1 billion annually in 2020–21 and are projected to rise to AU$15.8 billion by 2060–61, with the state's economy potentially shrinking by AU$700 billion by 2070. [1]
Flood risk poses an additional climate challenge. [1] Under maximum probability flood scenarios, the Hawkesbury-Nepean floodplain would require the evacuation of 234,000 people. [1] The Insurance Council has called on federal and state governments to provide AU$30.15 billion over ten years for a flood defense fund. [1] Recent planning changes have also reduced housing capacity in key developments: Marsden Park North was revised from 6,200 dwellings to 960, and Westfields from 4,500 to 2,900—changes that prompted opposition from the former emergency services commissioner. [1] The state's Resilience Land project has not yet delivered any residential land, while the Rebuild NSW program has completed 826 property buybacks of a planned 1,000. [1]