We learned that we are about to pass 400 parts per million in the amount of carbon in the atmosphere. That may not mean anything to you it certainly didn't mean anything to me. So here's the context for it. Full story
As Republicans block President Obama's nominee to head the EPA, Chris Hayes notes that carbon in the atmosphere is about to hit its highest level since the Pliocene Era, three to five million years ago, and Senator Sheldon Whitehouse smacks down a colleague who says God won't allow us to ruin the Ea
Chico State students rally against racially-tinged party atmosphere that has become common on holiday that honors civil rights and labor leader Cesar Chavez. KNVN's Bryan Callahan reports.
A meteor put on a spectacular show Friday as it entered the atmosphere on the East Coast. NBC’s Michelle Franzen reports.
Father Robert Barron, Monsignor Christopher Nalty, and NBC's Anne Thompson discuss how the atmosphere in Rome feels like a political campaign, why the chances of an American cardinal being chosen has gotten better, and who the front runners are right now.
Up host Chris Hayes delivers his Story of the Week on what America must do to prepare for future natural disasters.
Hawaii House candidate Tulsi Gabbard talks about her hope and optimism about the future of government in America, despite the extremely partisan atmosphere these days.
An artist's conception shows how Mars' atmosphere was stripped away by charged particles from the sun.
NEW YORK, NY - DECEMBER 11: A general view of atmosphere at "12-12-12 The Concert For Sandy Production" Load-In at Madison Square Garden on December 11, 2012 in New York City.
A combined NASA handout image shows the sun's innermost atmosphere as seen by the Solar Dynamics Observatory inside a larger image provided by the Solar and Heliospheric Observatory spacecraft taken November 8-9, 2012. A coronal mass ejection can be seen traveling away from the sun in the upper ri