The food supply will dwindle, and the poor will be hit hardest, but we'll all be affected as the world becomes more unstable.

The real cost of conservatives' cruelty cannot be measured in dollars and cents, but in people’s lives.

Keystone XL may have received a lot of public scrutiny, but Big Oil has other routes for its dirty, tar sands crude.

And deep-pocketed advocacy groups are lobbying for more -- a trend that alarms advocates of strong science education.

Scientists want you, the American public, to know that yes, they really do agree that climate change is happening, and its effects will be scary.

We've selected some of our favorite clips from Bill's interview with investigative journalist Julia Angwin, author of the new book, Dragnet Nation.

The Dan River coal ash spill is a case study in what happens when a regulator gets too friendly with the industry it regulates.

A new study looks at historical examples of ancient civilizations that failed and concludes that we may be headed in that direction.

"Sometimes the right thing to do in ordinary times is exactly the wrong thing to do in extraordinary times."

Edward Snowden's lawyer, the ACLU's Ben Wizner, discusses his growing concern with our surveillance state and what could happen if NSA programs aren't rolled back.