Christine Flowers , executive director of Keep California Beautiful , said Saturday 's volunteer activities supplement state and local government efforts -- which cost taxpayers about $ 500 million a year -- to address illegal dumping and littering . NEW : `` People are saying they ca n't believe what they are finding , '' leader says of trash cleanup . The city has been cleaning up the mess left behind by Hurricane Sandy and other storms that have hit New York City in recent years. `` National Day of Action '' Large-scale trash removal is planned for 10 sites , like Los Angeles and Philadelphia . At least 10,000 volunteers are expected to participate across the United States .
NEW : `` People are saying they ca n't believe what they are finding , '' leader says of trash cleanup . The city has been cleaning up the mess left behind by Hurricane Sandy and other storms that have hit New York City in recent years. `` National Day of Action '' Large-scale trash removal is planned for 10 sites , like Los Angeles and Philadelphia . At least 10,000 volunteers are expected to participate across the United States .