Many retired people always believe that they can continue to contribute to the community. Anne, an old lady living in North America has traveled to many different countries, created a campaign called "Fresher air and water for everyone". This campaign's aim is to reduce the amount of air and water pollution. Many people were interested in this activity, they invested a lot of money to expand the campaign, others recycled rubbish, which were collected from the rivers, sold them and left the money to the fund of the campaign. Anne, as the director of the campaign, has remained all of the profit to improve a system that can refresh the air and water, designed by well-qualified engineers.