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.

Take a tour of 11 White House Christmas trees

Obama's national monuments are a big deal

Meet 9 species named after Obama

3 reasons why you shouldn't lose hope

15 things Obama has done for the environment

10 things I've loved about the White House Kitchen Garden

7 endangered species with happy endings

Obama designates nation's first LGBT national monument at Stonewall Inn

106-year-old dances upon meeting the Obamas

Obama signs bipartisan ban on microbeads

Why the Paris climate talks might actually work

Have you met ROTUS? She's breaking down barriers at the White House