The planet is facing major ecological problems: global warming, loss of species diversity, loss of forests and arable land, disposal of garbage and toxic waste, pollution of air, land, and water, over-population, depletion of non-replaceable natural resources, diminution of food sources, ocean acidification and collapse of fisheries, among others. And the survival of creation as we humans have known it is at stake. Here are five principles for a Christian response. (Photo by NASA)