Tiana Masnaghetti of Palo Alto won in the middle-school category for her film "What About the Sea?" Los Altos Hills resident Katie Kirsch took first prize in the high-school category with "It's Time to Conserve Water." And in the open category, in which filmmakers of other ages competed, Palo Alto resident Matt Harnack won for "Fossil Fuel Free Film."

The winners were chosen from 15 finalist films, all of which were screened Thursday at the Cubberley Theater event. Overall, 54 films were submitted to the festival this year. Winners were presented with monetary prizes and trophies.

The ceremony will be shown on the Media Center's Comcast Channel 28, as well as online. The Media Center's Web site is at www.communitymediacenter.net.