A new study has found a link between the effects of climate change, the productivity of grasslands, and the proliferation of bison in Yellowstone National Park.
Soldiers’ National Cemetery, where U.S. President Abraham Lincoln delivered the “Gettysburg Address” in November 1863, appears in this Ikonos satellite image from June 25, 2003.
Acquired October 22, 2008, this true-color image of Sequoia National Park shows a network of varied ecosystem, including conifer forests, river valleys, alpine vegetation, and bare rocks.