Mauna Loa Observatory says carbon dioxide levels are the highest they've seen in all of human existence - KITV Honolulu
- Mauna Loa Observatory says carbon dioxide levels are the highest they've seen in all of human existence KITV Honolulu
- Atmospheric CO2 Levels Just Hit a Scary New Milestone Gizmodo
- 'We Don't Know a Planet Like This': CO2 Levels Hit 415 PPM for First Time in 3 Million+ Years Common Dreams
- CO2 in the atmosphere just exceeded 415 parts per million for the first time in human history TechCrunch
- CO2 Levels in the Atmosphere Reach Another Record High Interesting Engineering
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