Book excerpt: Many Heavens, One Earth is a collection of first-person voices from nine of the world religions. In fifteen articles, devotees and scholars reveal the contributions these traditions make to informing and motivating an ecological response to the environmental issues that beset planet earth. The spiritual messages of world religions have an indispensable and decisive role to play in addressing these environmental problems, for, at their root, these ecological issues are spiritual problems: Unless greed is replaced by moderation and sharing, materialism by spiritual insights and values, consumerism by restraint and simpler living, exploitation by respect and service, and pollution by caring and protection, nature’s hospitality will be foolishly rebuffed, and therefore our descendants will inherit a polluted and depleted earth. Religion can be, and must be, a part of this replacement. Since at least 90% of the world’s people claim allegiance to various major world religious traditions, religion can exert a crucial and transforming influence.