With deforestation surging in Brazil, as President Jair Bolsonaro encourages development of the Amazon, water is expected to become in increasingly shorter supply in the region.
The little town of Guyra in eastern Australia lies next to a freshwater lagoon just half a day's drive from Sydney, but its drinking water is due to run dry in 400 days' time.
When the thousands of water lorry drivers who shore up parched Chennai's overtaxed water delivery system went on strike for three days last month, to protest a ruling restricting their access to groundwater, a water crisis ensued.
