During the 1950s,the American environmental preservation movement was mobilized by

Question

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The proposed dam on the Green River in Echo Park, Utah was a key moment in the mobilization of the American environmental preservation movement. Environmentalists, led by the Sierra Club, rallied against the dam in order to preserve the natural beauty of Echo Park.

Note: While events such as the construction of the dam in the Hetch Hetchy Valley and the diversion of water from Owens Valley to Los Angeles also sparked conservationist movements, they occurred in the early 1900s and not in the 1950s as specified in the question. The options D and E are also not relevant to the environmental preservation movement in the 1950s.

During the 1950s,the American Environmental Preservation Movement Was Mobilized by