U.S. President Barack Obama

Barack Obama is the 44th president of the United States. Regarding the environment, President Obama's agenda has involved major policies to improve the nation's energy efficiency, promote renewable energy, reduce greenhouse gas emissions and lead the international effort to combat climate change. Obama has also preserved large areas of American wilderness from Maine to Hawaii, establishing more national monuments than any other president.

Obama gets first 3-D printed presidential bust

Obama proposes Earth's largest marine sanctuary

President Obama urges action on climate change during commencement speech

5 things to know about the EPA's new CO2 proposal

EPA's climate change proposal focuses on emissions from power plants

At long last, the White House solar array is up and running

Obama presents White House garden seed chest to Pope Francis

White House pastry chef is so inspired by his healthful creations that he’s leaving

Michelle Obama: It's time to get cooking

Obama protects 'gateway' to California coastal islands

Obama, Galifianakis spar on 'Between Two Ferns'

National summit to take on childhood obesity