"Muir is anything but out-of-date. He held the view—also more relevant than ever—that humans were not the be-all and end-all of life and that other species also had a right to exist and flourish. He could see what was happening to them through human ignorance and greed—the last of the passenger pigeons, which had darkened the skies with their sheer numbers in his youth, died in a Cincinnati zoo the same year as Muir passed away. How many species have followed it in the past century?"
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