A number of churches and church/denomination organizations are actively involved in addressing climate change and other ethical issues of how we care for God’s creation. The Government Energy Star Program has a special page for congregations about using energy efficiently.
If you search your denomination website, you will probably find information about your church’s stance on creation and stewardship.
Each year on college campuses, there is a National Campus Day of Prayer and Reflection on Global Warming. Sponsored by Stanford Memorial Chapel, the Rockefeller Memorial Chapel, and the Religion and the Environment Initiative at the University of Chicago, people of all faiths gather to discuss the pressing issues of global warming.
The National Council of Churches Eco-Justice Working Group focuses on a particular environmental theme and highlights ways individuals and congregations can celebrate and protect God’s creation.
Information about these groups and a large number of other ministries and coalitions can be found at EarthDay Network.