Vue Vang collected donated food from a Trader Joe’s in Fresno, Calif., where, under a new law, grocery stores are required to donate “the maximum amount of edible food that would otherwise be disposed.”Credit...Andri Tambunan for The New York Times In Seoul, garbage cans automatically weigh how much food gets tossed in the trash.California now requires supermarkets to give away — not throw away — food that is unsold but fine to eat.Within minutes, she had persuaded the staff members to give her several crates of milk marked “best by” the next day, as well as buttermilk and boxes of brussels sprouts, kale, cilantro, cut melons and corn.Last year, China’s top leader, Xi Jinping, began a “clean plate” campaign, calling for an end to the “shocking and distressing” squandering of food, even cracking down on video bloggers who eat excessive amounts of food on camera.Grocery stores are required to donate to groups like Ms. Vang’s “the maximum amount of edible food that would otherwise be disposed,” or soon face fines."