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Alert Canada
2
Atmosphere
Cape Grim Australia
2
Cape Kumukahi Hawaii
2
Carbon dioxide
2
Cold Bay Alaska Bay
La Jolla San Diego, Calif
Macquarie Island Tasmania
2
Mauna Loa Hawaii
2
Niwot Ridge Colorado
2
Oxygen
2
Palmer Station Antarctica
2
Samoa
2
South Pole Antarctica
2
Utqiaġvik Alaska
2
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