What is the fine-grained topic of the following text: Across our region, many grassroots groups are working alongside Interfaith Power & Light (DC.MD.NoVA) to engage people of faith in environmental efforts in specific denominations or communities, and others are working with people of faith specifically on watershed stewardship and sustainable food systems. Only return the topic.
Grassroots groups and Interfaith Power & Light engaging people of faith in environmental efforts and sustainable practices.