challenge: According to Heidi Cullen's book 'The Weather of the Future', what is a predicted consequence of a warmer world?
  
  A. More frequent and more violent storms, more hot spells, cold spells, droughts, and famines
  B. A decrease in greenhouse gases from burning fossil fuels
  C. Less frequent and less violent storms
  D. A reduction in the number of refugees
  Answer: 