Carbon Dioxide

The carbon dioxide peak is a few months away, but scientists are already expecting another record.

Atmospheric oxygen levels have declined over the past 1 million years, although not nearly enough to trigger any major problems for life on Earth, a new study finds.

Engineers have taken a tip from Medusa, it seems. They have stared down the pesky greenhouse gas carbon dioxide and turned it to stone.

Carbon dioxide emissions are fueling more verdant landscapes around the globe, but the potentially temporary greening doesn't mean global warming is good.

From helping cows get a handle on their flatulence to creating a giant atmospheric shield for the sun's rays, scientists have proposed some crazy climate fix ideas.

The Paris climate meetings begin on Monday. But what exactly are they?