Environmental institutions have been working on diversity efforts for the better part of five decades. This report discusses the findings of a study of three types of environmental institutions: 191 conservation and preservation organizations, 74 government environmental agencies, and 28 environmental grantmaking foundations. It also reports the findings of interviews conducted with 21 environmental professionals who were asked to reflect on the state of diversity in environmental institutions. The study focuses primarily on gender, racial, and class diversity in these institutions as it pertains to the demographic characteristics of their boards and staff. It examines the recruitment and hiring of new workers as well as the types of diversity initiatives undertaken by the organizations. The report also discusses other kinds of diversities such as cultural, sexual orientation, intergenerational, and rural-urban.