LOS ANGELES (AP) — New U.S. Ambassador to the United Nations Samantha Power is urging young activists to keep pushing for results and avoid bureaucracies that don't prioritize progress.

In her first public speech as ambassador in Los Angeles on Saturday, Power criticized the United Nations for allowing politics, ideology and entrenched habits to get in the way of its work at times, while praising those who get results and focus on problem-solving.

The remarks came during the closing ceremonies of the Fourth Estate Leadership Summit at UCLA Saturday, a gathering organized by the advocacy group Invisible Children.

The 42-year-old former foreign policy adviser to President Barack Obama was sworn in earlier this month after an overwhelming approval of her nomination.

Power is the youngest-ever head of the U.S. mission. She called on young people to avoid feeling overwhelmed by grim news from the world.