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- Death Valley National Park (38245 bytes)
74: ...gressional]] action in June of the same year. As improvements in mining technology allowed lower grades of ore ...
167: {{Commons|Death Valley|Death Valley}} - Global warming (53726 bytes)
160: ...al warming appears to be partially countering the improvements in the ozone layer caused by the reduction in the...
271: ...Sarah Bartlett explain the "Global Tragedy of the Commons at COP 6" in the Green Party journal Synthesis/Re... - Automobile (19750 bytes)
19: ... inventors and engineers shifted their efforts to improvements in [[railway]] [[locomotive]]s. The red flag law ...
47: ==Environmental improvements==
82: {{commons|Automobile}}
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