What is it that you think people are unable to see? Obviously, there have been no changes to the laws of physics and chemistry that control all these things. What is different today is the enormous influx of CO2 and methane from the human use of fossil fuels. There have been points in the pre-human past when GHGs were added to the atmosphere by volcanism or methane clathrate eruptions and the environment reacted precisely as the laws of physics and chemistry say it will react.Your graph shows the climate is working just how it did in the past. Why can't people see that?