DISCUSSION: The main idea is that there is new debate over how much volcano dust cools the Earth.
___________
- Nonsense. The researchers in the final paragraph say that regional effects may be significant
(lines 38-41), but they never say the effects will be larger than we thought.
Also, this ignores almost all of the passage. - No one says this. The scientists in the last paragraph imply that regional variations may be larger than global variations.
- Mass and Portman say that the global effect is weaker. And the scientists in the final paragraph only say that the regional effect may still be strong.
- CORRECT. This covers both Mass and Portman’s critique and the rebuttal which says that eruptions might still greatly affect regional temperatures.
- This only covers Mass and Portman’s argument. It ignores the rebuttal in paragraph four.
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