Earth's carbon dioxide levels highest in 3 million years, study says - USA TODAY

1. Earth's carbon dioxide levels highest in 3 million years, study says  USA TODAY
2. CO2 levels at highest for 3 million years -- when seas were 20 meters higher  CNN
3. “We’re Pushing Our Planet Beyond” –Even By Past 3 Million Years of History  The Daily Galaxy --Great Discoveries Channel
4. Carbon dioxide levels highest in 3 million years, shows unprecedented computer simulation  Phys.org
5. Carbon dioxide at its highest level in 3 million years: Study  Hindustan Times
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