One of the largest structures in the sky, as seen from our perspective, has only just been discovered. It’s an enormous cloud ...

Some Colorado state lawmakers are so worried about our air quality that they want climate warning labels on gas pumps.

Some Colorado state lawmakers are so worried about our air quality that they want climate warning labels on gas pumps.

Linn’s reimagined "petrofuture" maps, reworked from those issued by oil companies to encourage profligate car use, show what unrestrained fossil fuel burning creates: ...