Most of us have come to believe that the activities of humans are affecting our climate. Data shows that we are ever so slowing warming the earth's atmosphere by trapping certain gases that impede long wave radiation from exiting harmlessly into space. There has been an enormous push for an international effort to reduce these emissions and slow worldwide warming. The Kyoto Protocol is the most visible effort. If we do nothing to mitigate this warming trend, scientists estimate that the average temperature of the earth will rise by 4.7 degrees Fahrenheit by 2100. If the Kyoto Protocol is aggressively implemented over the next century, we can reduce that temperature rise by 0.86 degree F. It will cost about $15 trillion. In his book Cool It, Bjorn Lomborg, a Copenhagen economist, argues that we have far more important things on which to spend this money than keeping global warming under control. From examining the cost-benefits of alternatives and pointing to "Global Priorities," a list developed under the direction of four Nobel Laureates that ranks opportunities to better humanity as "very good," "good," "fair" and "bad," he makes a compelling case. Under "very good" is curing or controlling HIV/AIDS and controlling malaria; meanwhile, the cost benefits of global warming action fall under the "bad" column. We only have so much money, Lomborg argues. Let's spend it where it will do the most good for the most people. The book is a short read, but a compelling and competing view of one of the most important subjects of our time. No matter where you stand on the issue, it is an important book and required reading.