The debate about warming is about the outcome of a gamble. We are betting that the benefits of our industrial and agricultural activities increasing standards of living for the rich and poor alike will outweigh possible adverse consequences of an unfortunate by-product of activities, an increase in the atmospheric concentration of greenhouse gases that could lead t global warming and global climate changes. Some experts are warning that we are making poor bets, that global warming has started and that disasters are imminent. Others assure that the chances of global warming are so remote that the outcome of our wager will definitely be in favor. The impasse disquieting because the issue is of vital importance to each of us, it concerns the habitability of our planet. How long will it be before it is imperative that we take action?