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Read the excerpt below about global warming, and then answer the questions that follow.
"The world is getting warmer, and by the end of the st century could warm by another degrees Celsius ( degrees Fahrenheit).... And climate scientists at the heart of the research are now convinced that humanaction is to blame for some or most of this warming.... Everywhere climatologists look— at tree-ring patterns, fossil successions in rock strata, ocean-floor corings. . . they see evidence of dramatic shifts fromcold to hot to cold again....None of these ancientshifts can be blamed on humans....There is still room for argument about the precise role of the sun or other natural cycles in the contribution to global warming.... Richard S. Lindzen, a leading meteorologist at the Massachusetts Institute of Technology said... the picture of a consensus about global warming was 'misleading to the public and even to scientists. . . .' But most climate scientists. . . now believe that the climate is being influenced by human beings" — from World Press Review, February a. According to the article, what two points of view exist about global warming?
b. Why is the debate on global warming important?