Perhaps you heard the internet heave a grunt on August 11, the formal launch date of a new network of evangelical Christians alarmed about escalating temperatures, retreating ice, spreading droughts and rising sea levels.

Climate Caretakers -- whose founding members include Houghton College, the Lausanne Creation Care Network, Micah Challenge U.S.A., and Sojourners -- characterizes itself as a "campaign aimed at mobilizing Christians to prayer and action on climate change," according to Brian Webb, Houghton's sustainability coordinator.

"The time for silence on climate change within the church has passed," said Webb. "No longer a simply political or even a scientific issue, climate change is now a moral imperative that the church must respond to."