CO2 smashing extreme weather records, page-49

To me uncertainty indicates that we have much to learn and premature large scale changes will waste precious resources and time although they would be a great experiment. I support individual choices to reduce carbon usage.  Humans certainly contribute to warming but we don't have much certainty on the proportion of contribution.  

If it is 1.501 degrees C per doubling of CO2 (which is within the likely range) then it will be another 150 years till temperature increases by 1.5 degrees from 1950 levels.  There is still a chance, according to the IPCC that sensitivity is less than 1 degree and could be more than 6.  This is a good way of saying we have no real idea what role CO2 plays other than it is > 0.

We don't understand natural variability very well at all hence the uncertainty in sensitivity.  There is general denial of cyclical climate change due to natural causes and tendancy to attribute all changes to human cause hence poor decisions and excessive government control are seen as valid responses.  Ignorance of natural causes of climate change could be costly and brutal to humanity in the medium term.

We need to focus funding on research - energy, climate and climate adaptation (in case natural forces are more of a contributor than man).