U.S. and China, who produce 38 percent of the world's carbon dioxide emissions, have joined the Paris accord to keep the Earth's temperature from rising.
President Obama has expanded a national monument off the coast of Hawaii, creating a safe zone for tuna, sea turtles and thousands of other species.
President Obama is the first sitting U.S. president to project himself into virtual reality with a 360-degree representation of Yosemite National Park.
The National Park Service celebrated its 100th birthday with a living emblem made by people holding umbrellas in its colors on Washington's National Mall.
What do your music preferences say about you? Reaching Number 1 globally on Spotify, President Obama may have discovered a new career as a playlist maker.
1,000 young African leaders will gather in Washington for the third annual YALI Mandela Washington Fellowship. The main attraction will be President Obama.
The Republican and Democratic 2016 National Conventions will host famous names in U.S. politics, but there will also be faces that aren’t so familiar. Yet.
Mariana Costa Checa of Laboratoria discussed her company in front of cameras with President Obama and Facebook founder Mark Zuckerberg.
On July 20, 2015, the U.S. and Cuba re-established full diplomatic ties, and they are working together on environmental issues and more.