Oil-and-gas wells produce nearly a trillion gallons of toxic waste a year. An investigation shows how it could be making workers sick and contaminating communities across America.

The Berkeley Pit is a gorgeous, toxic former mining site in Montana that’s beloved by tourists. But unless it’s cleaned up soon, it could become the worst environmental disaster in American history.

A helicopter pilot crash-lands in the Arctic.

Following a storm that took 72 lives in Alabama.