WHAT IS THE TRUE SENSITIVITY OF THE CLIMATE?

Here is an interesting article on the subject - how much will temperature rise for a doubling of CO2? The pre-industrial level of CO2 is taken as 280ppm, so a doubling would be 560ppm. The current level is around 400ppm, so we still have some way to go. The world average rise in temperature is around 0.8 degrees Celsius. If the figure for doubling, as the article suggests, is around 2 C, then we are almost halfway there, and there is no cause for alarm. Since the relationship is a logarithmic one a second doubling, from 560ppm to 1120ppm will also only give rise to 2 C and that will take a very long time indeed.