Writer Tom Montgomery-Fate ponders falling maple seeds and Henry David Thoreau’s words.

What would the Democratic presidential candidates do about global warming? Living on Earth's Jeff Young finds out most have aggressive plans on climate change, but they're squabbling over which would have the will to really do something.

Environmental activist and physicist Vandana Shiva talks global food politics with Living on Earth's Steve Curwood. Shiva is editor of the new book, "Manifestos on the Future of Food and Seed," which advocates local, organic and diverse food production.

Professional rock climber Steph Davis is passionate about rocks. She’s traveled the world in search of her next ascent, scaling mountain peaks from Patagonia to Pakistan. Living on Earth’s Ashley Ahearn produced an audio profile of Steph Davis.

If you ask Paul Ehrlich, a professor of population studies at Stanford University, he’ll tell you the new UN report on the state of the global environment is old news. Dr. Ehrlich talks with host Bruce Gellerman about overpopulation, famine, and climate change, and the urgent need for the human species to save itself from disasters of its own making.

One in four species of non-human primates are in danger of going extinct, according to a new report released by Conservation International and the World Conservation Union. Host Bruce Gellerman hears the sounds of the Sumatran Orangutan and talks with Russ Mittermeier, president of Conservation International, and chairman of the report.

A recent study finds removing lead from gasoline and paint 20 years ago could be linked to a drop in national crime rates. But, the story isn't that simple. Host Bruce Gellerman talks with Kim Dietrich, professor of environmental health at the University of Cincinnati College of Medicine, to find out what other factors make certain individuals more likely to commit crimes, and how lead’s involved.