| web | https://www.ecowatch.com/greenhouse-gas-levels-2503831950.html?utm_source=EcoWatch+List&utm_campaign=6d40d4d209-EMAIL_CAMPAIGN&utm_medium=email&utm_term=0_49c7d43dc9-6d40d4d209-85951321 |
| author | NASA |
| publication | EcoWatch |
| date | 2017-10-30 |
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