A TOEFL Reading passage on climate science states: "Feedback loops—both positive and negative—play a crucial role in regulating Earth's temperature." In this context, a "positive feedback loop" means:
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A
A beneficial change that improves environmental conditions
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B
A process in which an initial change amplifies further change in the same direction
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C
A scientific model that produces optimistic predictions
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D
A feedback mechanism that stabilizes temperature at a constant level