An epidemic of tree deaths in California due to drought and bark beetles is sparking a review of state and federal policies. The Little Hoover Commission, a state oversight board, is considering how to curb the problem, before it reshapes California’s forests. “We hope to kind of come in and take a big picture look on policy changes the state can make,” said Carole D’Elia, executive director of the commission. “Can we influence at all the United States Forest Service and federal government policies?”