Mountains
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Daredevil walks into open mouth of active volcano: Watch the action caught on GoPro video
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Mountain air has high levels of ozone pollution, too
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Think mountain air is always clean? Study in Colorado says otherwise
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Tibetans inherited gene for high-altitude living from ancient humans
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Ancient Tibet may be origin of Ice Age mammals, fossils reveal
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China's plan to bulldoze mountains poses environmental threat, warn researchers
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