Eco-Justice Ministries is an ecumenical agency based in Denver that helps churches care for the Earth. The Rev. Peter S. Sawtell is executive director.

Hava Tirosh-Samuelson is a professor of modern Judaism and history at Arizona State University in Tempe, where she studies Judaism and ecology, bioethics, and religion and science.

Kim Winchell coordinates the Interfaith Climate Change Campaigns: Michigan (formerly the Michigan Interfaith Global Warming Campaign), both based in Freeland, Mich.

David Haberman is a professor of religious studies at Indiana University in Bloomington. He teaches on the subject of religion and ecology, particularly in regards to South Asian religions. His books include River of Love in an Age of Pollution: The Yamuna River of Northern India and Understanding Climate Change Through Religious Lifeworlds.

The Rev. Angelique Walker-Smith is executive director of the Church Federation of Greater Indianapolis, which has participated in the National Council of Churches’ Faith-based Climate and Energy Campaign.

The Web of Creation, an ecumenical site maintained by the Lutheran School of Theology at Chicago, provides congregational resources on ecology and religion. Contact director David Rhoads.

Faith in Place works with religious and spiritual leaders in Illinois on issues of environmental sustainability. It has offices in Chicago, Champaign and Waukegan, Ill.

David Landis Barnhill is director of environmental studies and an English professor at the University of Wisconsin in Oshkosh.

Habitat for Humanity has a Better Built Program that promotes energy-efficient, environmentally friendly construction and encourages good stewardship of natural resources and raises awareness of the environmental impact of house building.