Dought may presage social unrest and political problems in Brazil.

The average man can only live for three days without water:  Sao Paulo State’s 10 million people are running out of water due to a drought of biblical proportions, the worst since records began in 1930.  Reservoirs are at 12% of capacity.  (64% is normal for this time of year.)  Water will fall below reservoir intake pipes by mid-June, during the World Cup. The causes: drought; rising population; lack of investment.

Physical danger produces social unrest, and in extreme cases revolution. Political instability can be expected.