Final answer:
Theodore Roosevelt's conservation passion was shown through vetoing Hetch Hetchy Dam, creating national reserves, and appointing John Muir.
Explanation:
Theodore Roosevelt's passion for conservation manifested itself through various actions:
- By vetoing Congress's approval of the controversial Hetch Hetchy Dam: Roosevelt supported preservation and opposed developments that could harm natural beauty.
- With the creation of national forests, monuments, preserves, and parks: Roosevelt set aside vast areas for public use and wildlife protection.
- With the appointment of John Muir, a preservationist, as chief of the Forest Service: Roosevelt valued preservation ideals and incorporated them into his administration.
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