Actor and newly appointed United Nations Messenger of Peace, Leonardo DiCaprio, voiced his concerns during the opening session of the U.N. Climate Change Summit in New York on Tuesday.
The U.S. Central Command released video of overnight U.S. operations in Syria on Tuesday. The military airstrikes included the use of Tomahawk cruise missiles launched by the U.S. Navy from the Persian Gulf and the Red Sea.
As the war against the Islamic State expands with airstrikes in Syria, here's what senior national security correspondent Karen DeYoung, national security reporter Greg Miller, White House correspondent Katie Zezima and foreign affairs writer Ishaan Tharoor have to say about what it all means.