“The unprecedented drought now affecting São Paulo, South America’s giant metropolis, is believed to be caused by the absence of the “flying rivers” − the vapor clouds from the Amazon that normally bring rain to the center and south of Brazil.
Some Brazilian scientists say the absence of rain that has dried up rivers and reservoirs in central and southeast Brazil is not just a quirk of nature, but a change brought about by a combination of the continuing deforestation of the Amazon and global warming.
This combination, they say, is reducing the role of the Amazon rainforest as a giant “water pump,” releasing billions of liters of humidity from the trees into the air in the form of vapor.
Meteorologist Jose Marengo, a member of the Intergovernmental Panel on Climate Change, first coined the phrase “flying rivers” to describe these massive volumes of vapor that rise from the rainforest, travel west, and then − blocked by the Andes − turn south.
Satellite images from the Centre for Weather Forecasts and Climate Research of Brazil’s National Space Research Institute (INPE) clearly show that, during January and February this year, the flying rivers failed to arrive, unlike the previous five years.
Deforestation all over Brazil has reached alarming proportions: 22 percent of the Amazon rainforest (an area larger than Portugal, Italy and Germany combined), 47 percent of the Cerrado in central Brazil, and 91.5 percent of the Atlantic forest that used to cover the entire length of the coastal area.”
Read more: Climate Central