GASES EFECTO INVERNADERO
- OBSERVATORIOS NOAA: https://www.esrl.noaa.gov/
- CD. KEELING - "The concentration or carbon dioxide in the atmosphere ": https://web.archive.org/web/20120806225956/http://sio.ucsd.edu/special/Keeling_50th_Anniversary/images/keelling_tellus_1960.pdf
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