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Alert Canada
4
Atmosphere
Cape Grim Australia
4
Cape Kumukahi Hawaii
4
Carbon dioxide
4
Cold Bay Alaska Bay
Macquarie Island Tasmania
4
Mauna Loa Hawaii
4
Niwot Ridge Colorado
4
Oxygen
4
Palmer Station Antarctica
4
Samoa
4
South Pole Antarctica
Utqiaġvik Alaska
4
Barrow Alaska
2
La Jolla Pier San Diego, Calif
2
La Jolla San Diego, Calif
2
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