Many people in these forums believe that global warming is occurring as a result of the activities of humankind. In light of this view, let us suppose that scientists created a global cooling machine. Possibly a large flat sheet of material that would be in permanent orbit blocking out 0.1% of the sun's rays from ever hitting the earth, or maybe it's a way to create artificial clouds that will reflect some sunlight back out into space; the actual science is not important for this question. Anyhow, it's finally built and you were just elected President of the World. Would you turn it on? I would hesitate to do so, myself, being uncertain that global warming is occurring because of our impact, and I would worry about possible unintended consequences due to the unpredictability and complexity of the system. I think we'd probably be better off leaving things as they were. What would you do? Peace. Although I would certainly not hesitate to turn on the "Reduce Human Impact On The Environment" machine.