"A Voice for Earth" is a collection of poems, essays, and stories that together give a voice to the ethical principles outlined in the Earth Charter. The Earth Charter was adopted in the year 2000 with the mission of addressing the economic, social, political, spiritual, and environmental problems confronting the world in the twenty-first century.

Part 1 of the book, "Imagination into Principle," comprises Steven C. Rockefeller's behind-the-scenes summary of how the language for the Earth Charter was drafted. In part 2, "Principle into Imagination," ten writers breathe life into its concepts with their own original work. Contributors include Rick Bass, Alison Hawthorne Deming, John Lane, Robert Michael Pyle, Janisse Ray, Scott Russell Sanders, Lauret Savoy, and Mary Evelyn Tucker. In part 3, "Imagination and Principle into a New Ethic," Leonardo Boff offers a new paradigm created through reflecting on the concept of care in the Earth Charter.