text: One example of an impact of changing aerosol radiative forcing could be the precipitation 
  changes in northern South America including Amazonia. All ensemble members show a general 
  drying in this region, as seen in RX5day and mean run-off results. The reduction in Rx5day is 
  particularly notable, because the general expectation would be for an increase in heavy rainfall 
  events in a warmer climate, as is seen in most other regions in these projections. This reduced 
  rainfall in the Amazon region may be associated with the reducing net negative aerosol radiative 
  forcing in the North Atlantic [40]. CO2 physiological forcing may also play a role here [41,42]. 