Muir’s disapproval of the plans to build a dam in the Hetch Hetchy Valley are because:
It is was a glacier carved valley which has a towering cliffs and waterfalls cascading onto a serene valley floor in California.
However, the author stated that Muir’s disapproval of the plans to build a dam in the Hetch Hetchy Valley was because they believed the beauty of the valley should not be sacrificed and the sanctity of the national parks should not be violated.
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