Created in 1964, the National Wilderness system now covers about 5 percent of the United States. See National Geographic photographer Michael Melford's photos of current and proposed National Wilderness areas.
Here are six ways humans are permanently changing the deep Earth, from mining to underground nuclear testing.
Here are some recent striking images of our planet from the Web.
See how climate change is causing tropical fish to devour undersea forests and the migration of birds. Plus more of our favorite recent Earth shots.
A nuclear power plant becomes a theme park, twin tornadoes touch down and beachgoers take in a bomb blast.
Rachel Sussman spent a decade traveling to remote locations around the world to photograph continuously living organisms that are 2,000 years old and older.
To kick off Earth Day, check out a snapshot of remarkable moments from around the world.
NASA holds its second TournamentEarth photo competition -- where users create their own brackets -- and the best images of the planet go head to head.
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