The release of CO₂ and other so-called greenhouse gases into the atmosphere, leading to the "greenhouse effect," has caused a major concern about man's environmental and ecological responsibilities. This paper asks whether Christians have a distinctive viewpoint on these matters. First, it is noted that the issues raised go far beyond scientific analysis; profound consequences for economic life can follow. In a following section, the scientific evidence for the greenhouse effect is rehearsed in more detail. The next section gives an economic analysis of the issues. Solutions proposed are then critically analyzed in the light of Christian ethical principles.