Re: Day Zero
I am not concerned about the end of the world that 5 billion years away.
The northern part of Australia has plenty of water in summer because of the monsoon (late this year). There have been many attempts to farm the north but the major attempts have been failures - think Ord River scheme - the main industries are still either mining or cattle with not much other agriculture - some include mangos, sugar, coffee, pineapples etc.
What does concern me is the change in climate because there is a definite pattern emerging toward drier times over the last 100 years.
Desal plants are energy intensive and there has been massive resistance to recycling grey water or sewage for domestic use. BTW both are used by industry but we need to overcome the 'yuck' factor. (I recall a joke Ben Elton once made about a cocktail in the UK not being complete without a turd floating in it when discussing this subject)
https://www.abc.net.au/news/2018-03-...-water/9546900