The one main issue that remains unsettled Is positive feedback as CO2 concentrations increase. There is no scientific proof that positive feedbacks are occurring today or might occur in the future.
This book examines actual evidence of what has occurred on earth over the past fifty years or so and has concluded that the prediction of a 3, 4 or 5 degree Celsius increase in temperature by the year 2100 cannot be justified on an unbiased examination of the scientific evidence available. The authors claim that computer based models based on hypothetical predictions of positive feedback based on increasing CO2 emissions are not fit for purpose is spot on and should be given more attention in the public media.
