TED Video-Majora Carter

A circle of concern is basically the focus of what you are trying to change. In this video, Majora Carter wanted to create a better community for the people of the South Bronx. A circle of influence is the factors that are looked at to change what you are concerned about, or your circle of concern. To expand your circle of influence, I believe you could become more active in the area of your concern. For example, if you are trying to create a more "green" community, you could become involved with the gardening club of your community.