LONDON — Actress Geena Davis called on Tuesday for greater efforts to stop the use of negative stereotypes of women and girls in film and the media as she unveiled details of a new global drive to address gender imbalance in the movie world. Davis, who founded the Geena Davis Institute on Gender in Media 11 years ago, has joined forces with the BFI London Film Festival to hold the first global symposium on gender in film outside the United States in London in October. The Oscar-winning actress, who has held conferences promoting women in creative media in the United States since 2008, expressed concerns that films are reinforcing negative gender stereotypes with movie audiences of all ages. “Media images have a huge impact on our perceptions and on our social and cultural beliefs and behaviors,” Davis said in a statement. — Reuters