Economy?, nuclear war?, class struggle?, ethnic tensions?
Nope. Mere and simple imminent ecological disaster caused, probably, by global warming.
Timeline? A century or two ahead?, several decades?, an undefined future?
Nope. By October this year.
While the USA and China are succumbing to brutal massive floods, Australia is facing the worst of the worst drought ever. It's been nicknamed the Big Dry and it's been going on for many years now, since 2003, sending many farmers into bankrupticy and becoming one of the factors behind increased food prices worldwide (as Australia used to be one of the main food exporters of the World).
Drought affected croplands
Now an expert panel has warned that the most important river system of Australia, the Murray-Darling basin, the Australian breadbasket, will be beyond the point of recovery unless it gets enough water by October. In practical terms it means that the whole ecology of the single most important agricultural and economical region of Australia will take at least a decade to recover or will not recover at all in any foreseable future.
The Murray-Darling basin
The reaction of the government? Wait until November. Incredible but true. The report has been leaked to the press anyhow sparkling great concern and political scandal in the island-continent.