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All these could be rendered pretty much moot with the revelation of the information in this exciting article:

GLOBAL 'SUNSCREEN' HAS LIKELY THINNED, REPORT NASA SCIENTISTS

IF it is finally conceded by the global warming alarmists that aerosols have been blocking the sun in recent decades, and is now not as important, that leaves a VERY HIGH correlation with the Sun (imagine that) as the major contributor to warming, with "greenhouse gasses" as minor factors. I strongly believe this to be the case, and believe that CO2, etc, contributes less than 20% of the 20th century warming. See, from this site http://www.junkscience.com/Greenhouse/cause.html this graph:

All this helps. Clearly not enough has been done to eliminate the obvious cause of GW, i.e., the Sun, before looking to CO2 and man made effects. However, the key issue first is to size the problem. How much is the temperature rising and where? Unless these questions can be answered everything else is problematic. A number of folks are concentrating on re-looking at how global temperature has been measured. In general they believe that the current methods are tainted with certain biases built in to the processes. For example, there is an argument that the global temperature does not correctly factor in Urban Heat Island effects - and that the population growth in and around key weather stations in Siberia and Northern Canada, which are weighted very heavily in the calculation of a single global temperature, may have produced a misleading result. The net result for example would be a blue temperature line that more closely follows the red solar line in your chart. Take a look at www.climateaudit.org if you are interested in some of the careful work being done to review the mysterioulsy difficult to get raw data from all these weather stations.