D) There is no way to prove its validity.
59. What is the chief reason for the rise in corn prices according to the author?
A) Demand for food has been rising in the developing countries.
B) A considerable portion of corn is used to produce green fuel.
C) Climate change has caused corn yields to drop markedly.
D) Inflation rates have been skyrocketing since the 1970s.
60. What does the author say about global wildfire incidence over the past 70 years?
A) It has got worse with the rise in extreme weathers.
B) It signals the early stages of global warming.
C) It has dropped greatly.
D) It is related to drought.
61. What does the author think of the exaggerated claims in the media about global warming?
A) They are strategies to raise public awareness.
B) They do a disservice to addressing the problem.
C) They aggravate public distrust about science.
D) They create confusion about climate change.
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