Climate response to increases in carbon dioxide turns CO2 itself into a more potent greenhouse gas. - Daily Kos
- Climate response to increases in carbon dioxide turns CO2 itself into a more potent greenhouse gas. Daily Kos
- Atmospheric CO2 Has Reached Levels Not Seen in 14 Million Years, New Study Finds Truthout
- 'Call to Action': CO2 Now at Levels Not Seen in 14 Million Years Common Dreams
- Stratospheric effect boosts global warming as carbon dioxide levels rise – Physics World physicsworld.com
- CO2 levels linked to cascading effects that last for millennia Earth.com