WASHINGTON, DC - SEPTEMBER 15: U.S. President Barack Obama arrives at the Our Oceans conference at the State Department's Harry S. Truman building September 15, 2016 in Washington, DC. According to the State Department, the conference will bring scientists, political leaders and advocates together to focus on 'key ocean issues of our time Ð marine protected areas, sustainable fisheries, marine pollution, and climate-related impacts on the ocean.' (Photo by Chip Somodevilla/Getty Images)