The Keeling Curve Turns 50
Jan 30, 2008

The inception of the "Keeling Curve," a history of atmospheric carbon dioxide levels, marked a key moment in American...

Emperors of the Extreme
Jan 23, 2008

Emperor penguins can flourish in locales where few other animals roam. But scientists now wonder if they can adapt to...

History's Warming
Jan 7, 2008

An ancient global warming episode drastically changed the planet. Life on Earth needed 200,000 years to recover. What...