CO2 levels in atmosphere higher than any point since evolution of humans - WLS-TV
- CO2 levels in atmosphere higher than any point since evolution of humans WLS-TV
- 415: The Most Dangerous Number Rolling Stone
- CO2 Levels Reach Highest Levels in Human History Inhabitat
- Carbon dioxide hits a level not seen for 3 million years. Here's what that means for climate change — and humanity. NBC News
- 'Record-setting' doesn't do our CO2 levels justice. This chart does. Popular Science
- View full coverage on Google News