Global Warming: The Campus Non-Debate: Is the earth in a global warming phase? If it is, how severe is this trend? Is the warming primarily a product of natural causes or do man-made factors play a dominant role? If man-made factors are important, is the main culprit the carbon dioxide (CO2) produced from the burning of fossil fuels or are other factors more salient? What is the evidence for and against the anthropogenic and CO2 theories of global warming? If we really are in a period of sustained global warming, will this trend prove a net benefit or a net loss to human welfare?