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QuizLong Text

Human Impact on the Environment

Question 3 • Grade 8 World Cultures and Geography A

Not all scientists agree with commonly held views on global warming. Describe at least three issues on which there is some disagreement.

Answer

Answer:

Scientists overwhelmingly agree that Earth is warming and that human greenhouse-gas emissions are the main cause of recent warming. There is some disagreement and uncertainty about details. For example, estimates differ about how much warming will occur under different future emissions pathways and how quickly it will happen. Scientists also study how strongly particular regions will be affected, since rainfall, drought, and temperature changes will vary by place. There is further uncertainty about the exact timing and scale of effects such as sea-level rise and changes in particular extreme weather events. These debates concern details and projections rather than the basic conclusion that human activity is warming the climate.

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