The Long term Solution for Perth Australia is likely desalination

I wrote in the last few months about Perth, Australia where Global Warming could theoretically turn it into a Ghost town. So, the likely long term solution there would be desalination for years it doesn't rain enough to sustain life in that City in the west of Australia.

Here is something from Wikipedia on it:

Begin partial quote from:

Desalination - Wikipedia, the free encyclopedia

Desalination is particularly relevant in dry countries such as Australia, which traditionally have relied on collecting rainfall behind dams for water.
According to the International Desalination Association, in June 2015, 18,426 desalination plants operated worldwide, producing 86.8 million cubic meters per day, providing water for 300 million people.^[5] This number increased from 78.4 million cubic meters in 2013,^[4] a 57% increase in just 5 years. The single largest desalination project is Ras Al-Khair in Saudi Arabia, which produced 1,025,000 cubic meters per day in 2014,^[4] although this plant is expected to be surpassed by a plant in California.^[6] Israel produces a higher proportion of its water than any other country, totaling 40% of its water use.^[7]

Schematic of a multistage flash desalinator
A – steam in
B – seawater in
C – potable water out
D – waste out
E – steam out
F – heat exchange
G – condensation collection
H – brine heater

Plan of a typical reverse osmosis desalination plant

Contents

• 1 Methods
• 2 Considerations and criticism
  • 2.1 Energy consumption
  • 2.2 Cogeneration
  • 2.3 Economics
  • 2.4 Environmental
• 3 Experimental techniques
  • 3.1 Waste heat
  • 3.2 Low-temperature thermal
  • 3.3 Thermoionic process
  • 3.4 Evaporation and condensation for crops
  • 3.5 Other approaches
• 4 Facilities
• 5 In nature
• 6 See also
• 7 References
  • 7.1 Further reading
  • 7.2 Articles
• 8 External links
•  
• For example, Global warming is going to cause the ocean this century to end the livelihoods of many people in Bangladesh who live near the ocean at low altitudes. It is also slowly inundating islands around the world too. 
•  
• Another interesting thing my friend was saying that Volcanic islands like the Hawaiian Islands slowly settle and sink a little as time goes on even as the oceans rise. I was mentioning how at a resort I have visited many times in Maui since about 2000 I have watched the ocean come higher and higher at high tide into bushes there on the edge of the ocean where once in 2000 they wouldn't have come wihin 20 to 50 feet horizontally to those bushes any time I visited. This doesn't mean during a storm or Hurricane that water wouldn't come that high if it was directed in that direction. I'm just talking about normal (without a storm) high and low tides. 
• 
  
• So, I'm thinking it is a combination since 2000 of the islands settling (because they are volcanic) and the oceans rising simultaneously at this point.
• 
  
• My friend was also telling me how some of the Aleutian Islands up near Alaska were once over the Same volcanic vent that is where Volcano National park is now. So, as that tectonic plate ha moved over thousands and millions of years that land by the Hawaiian volcanic vent is now up by Alaska. Pretty Amazing Earth we live on!