The new research has profound implications for the environmental summit in Rio. Among other things, the findings demonstrate that dramatic climate change is nothing new for planet Earth. The benignglobal environment that has existed over the past 10,000 yearsduring which agriculture, writing, cities and most other features of civilization appearedis a mere bright spot in a much larger pattern of widely varying climate over the ages. In fact, the pattern or climate change in the past reveals that Earths climate will almost certainly go through dramatic changes in the futureeven without the influence of human activity.
21.Farming emerged as a survival strategy because man had been obliged .
A) to give up his former way of life
B) to leave the coastal areas
C) to follow the ever-shifting vegetation
D) to abandon his original settlement
22.Earth scientists have come to understand that climate .
A) is going through a fundamental change
B) has been getting warmer for 10,000 years
C) will eventually change from hot to cold
D) has gone through periodical change
23. Scientists believe that human evolution .
A) has seldom been accompanied by climatic changes
B) has exerted little influence on climatic changes
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