The Center for Biological Diversity, which earlier this summer threatened to sue federal officials and BP over Kemp’s ridley sea turtles being killed in oil fires, now is going after Interior Secretary Ken Salazar for failing to assess how the Deepwater Horizon oil spill is impacting endangered whales and sea turtles in the Gulf of Mexico.

If you're headed for the North Rim at Grand Canyon National Park in August, you need to be aware of some upcoming closures of key roads due to construction work. Here's the current schedule to help you plan your trip.

Greetings from Lewis & Clark Trail State Park in eastern Washington, where we are finishing our seventh week on the road. Heading east on the Lewis and Clark National Historic Trail, we've followed the Columbia River and found memorable places galore.

On September 25th, more than 175,000 people are expected to volunteer for National Public Lands Day at more than 2,000 of our nation’s beautiful public lands. Volunteers will perform work ranging from pulling invasive species, clearing trails, planting trees and removing trash.