Reuters: South America's biggest and wealthiest city may run out of water by mid-November if it doesn't rain soon. So Paulo, a Brazilian megacity of 20 million people, is suffering its worst drought in at least 80 years, with key reservoirs that supply the city dried up after an unusually dry year. One of the causes of the crisis may be more than 2,000 kilometers away, in the growing deforested areas in the Amazon region. "Humidity that comes from the Amazon in the form of vapor clouds - what we call...