Urban problems are pollution, (air, water, soil) rapid population growth, growing poverty, political impact of problems and unequal distribution of wealth. Some cities are trying to get rid of these problems by doing projects. Lima, Peru for example, has a self-help housing co-op where people were given a desert area to live on. They slowly developed roads, water, electricity, homes, trees, and gardens. This project provided homes for over 20000 poor people. Denmark also has co-housing projects. These projects are about interaction with your neighbour. They provide small, affordable housing to families and they share community facilities such as workshops and play rooms. Th