The current environmental crisis raises important theological questions concerning God’s relationship to the world and Christian responsibility. If human beings are destroying life on earth, how are we to think about God’s providential involvement with the world, and what becomes of Christians’ belief in the future of creation? How do we affirm that salvation happens through the humanity of Jesus Christ, while at the same time professing the cosmic scope of salvation? And, how, exactly, does the concern for human well-being relate to stewardship with nature and the earth? This dissertation offers a constructive theological response to these questions to further the Churches’ involvement with the environment. Observing an anthropocentric and instrumental view of nature, and a separation between the doctrines of creation and salvation in modern Protestant theology, the dissertation explores a nature-affirming and socially just vision of creation and salvation. Especially drawing on the theologies of Protestant eco-theologians Sallie McFague, John Cobb Jr., and Jürgen Moltmann, the study develops an understanding of salvation within the larger context of creation, and as the fulfillment of creation rather than as dissociation from it. The dissertation further argues for a theological perspective which sees God’s eschatological promise not so much as a transcendent future event but as already incarnate in concrete practices of eco-justice - that is, human beings working with nature for just relationships and a sustainable future for the earth. Such a theology can enable Christians to view Christian mission in a new way, that is, as suffering with, healing, and liberating, all of creation, and help sustain viable church practices in the face of the environmental crisis.