Public law to save private beach property?

Australia is experiencing "accelerated climate change", resulting in more frequent storms, droughts and rising temperatures due to global warming, say scientists. This prompts beachfront home owners to attempt to fortify their properties against rising seas and storms, ...
..Some observers fear that the public value of the beaches will be destroyed by individual measures to protect properties.
It is estimated that over 700,000 coastal properties in Australia are threatened by rising sea levels. Coastal flooding and erosion cost New South Wales 200 million Australian dollars a year. UN Climate Change Conference