What is the fine-grained topic of the following text: As a leader of a Walking Bus scheme I know how hard it is to find volunteers and in Dorset as the proposal is to close most of the smaller libraries, anyone wanting to volunteer will be sitting in the warm keeping the libraries open and not standing out in all weathers, putting their lives in danger to see parents and children safely to school. Only return the topic.
Challenges in finding volunteers for a Walking Bus scheme due to potential closure of smaller libraries in Dorset.