Final answer:
The excerpt that appeals to pathos emphasizes the potential tragic consequences of environmental disasters.
Explanation:
The excerpt from Silent Spring that best appeals to readers' pathos is:
"Yet every one of these disasters has actually happened somewhere, and many real communities have already suffered a substantial number of them. A grim specter has crept upon us almost unnoticed, and this imagined tragedy may easily become a stark reality we all shall know."
This passage evokes a sense of urgency and fear, appealing to readers' emotions by highlighting the potential real-life consequences of environmental disasters detailed in the book.
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