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| Barrow, Alaska |
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| Cold
Bay, Alaska |
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| Alert, Canada |
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| Cape
Meares, Oregon |
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| Trinidad
Head, California |
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| Niwot
Ridge, Colorado |
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| Key
Biscayne, Florida |
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| Terceira
Island , Azores (Portugal) |
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| Mace
Head, Ireland |
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| Mt.Cimone, Italy |
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| Ryori, Japan |
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| Mauna
Loa, Hawaii |
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| Cape
Kumukahi, Hawaii |
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| Ragged
Point, Barbados |
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| Ascension
Island, Atlantic Ocean (United Kingdom) |
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| Samoa, Pacific Ocean (United States) |
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| Amsterdam
Island, Indian Ocean (France) |
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| Cape
Grim, Tasmania, Australia |
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| Baring
Head, New Zealand |
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| Syowa
Station, Antartica (Japan) |
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| Vostok
Station, Antartica (Russia) |
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| Amundson
Station, South Pole (United States) |
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Sampling Sites | Greenhouse Gas Molecules | Global Warming | ChemConnections