Tuesday, October 23 at 10 p.m. — Investigate the groups that changed the debate on climate and redefined the politics of global warming.

Wednesday, November 23 at 8 p.m. — Revel in the resurgence of the bald eagle, the American emblem that’s come roaring back from the brink of extinction.

Monday, April 18 at 9 p.m. — John Muir is remembered and revered as the father of the environmental movement and the founder of the Sierra Club.

Monday, April 19 at 9 p.m. — Acclaimed director, Robert Stone, traces the origins of the modern environmental movement.