- Study: Most carbon dioxide in atmosphere in 3 million years | TheHill The Hill
- Carbon Levels Are Higher Than They've Been in Past 3 Million Years, Scientists Reveal Common Dreams
- CO2 Levels Are Now at a 3 Million-Year High EcoWatch
- Dire future etched in the past: CO2 at 3-million year-old levels Phys.Org
- View full coverage on Google News
from Science - Latest - Google News http://bit.ly/2I5PLbY
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