May 18, 2013 — This week, the National Transportation Safety Board recommended lowering the legal limit of blood alcohol content for drivers to .05 or even lower. Currently, it's illegal to drive in all states with a BAC of .08 or higher. Host Scott Simon speaks with Dr. Anthony Liguori of Wake Forest School of Medicine about alcohol's impact on driving ability.

Jan 25, 2013 — Rather than rest in retirement, a group of volunteers is restoring land in Arizona's Ironwood Forest National Monument to its natural habitat. Their main goal is to eliminate invasive buffelgrass, which is taking over and causing a fire hazard. It's no small task — they've removed it from the same place 40 times.

Jan 21, 2013 — Scientists are worried about the elusive members of the weasel family that live in parts of Olympic National Forest in Washington state. To see whether martens are endangered, volunteers are installing remote camera traps to take photos of the animals.

Nov 3, 2012 — The 70-foot spruce has left its home in White River National Forest and is heading by truck to Washington, D.C. Along the way, it will stop in 10 states. One of the drivers, Gerald Morris, is looking forward to the trip: "It's a great thing to be involved in such a project."

Aug 28, 2012 — Miami may bring to mind images of the sea and palm trees, but according to park advocates, it also suffers from a lack of green space. That can make it difficult for downtown residents to find places to enjoy the outdoors. Advocates are trying to remedy that — in the face of ongoing downtown development.