Muslims, like those of many faiths, are compelled by their religion to praise the Creator, take care of each other, and take care of the planet. Those are their sacred mandates, as written in the Quran. While the call to love Allah and one another won’t surprise many, the deep and long-standing convergences between Muslim theology and environmentalism aren’t widely recognized within other religious and secular cultures at large or even among some American Muslim communities. In this unique project, Ibrahim Abdul-Matin seeks to change that. Green Deen (“deen” means “way” in Arabic) is a call to devotion, prayer, and service, a “friend-raising” project, a community-building opportunity, and a marriage of faith and reason. Abdul-Matin draws on research and interviews with prominent Muslim scholars, theologians, and community leaders to trace Islam’s historical and contemporary preoccupation with humankind’s collective role as stewards of the Earth. He reveals how Islam’s...