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1) Each color is a named proxie. The thick black line is their average.
2) Recent proxies are unnamed, and have a higher resolution.
3) The older proxies are low resolution, so short term spikes are smoothed out. In 50 years, if we have cooling, the newer proxied smoothed to low resolution would no longer appear as they are now.
Please accept and understand the scientific facts. You need to be able to explain the graphs you find, and you obviously can not.
Simply being condescending does not one authoritative, it just makes them think they are.
No where in the graph does it imply that the resolution is less than 50 years. It looks closer to 300 years. From the description of the graph:
The main figure shows eight records of local temperature variability on multi-centennial scales throughout the course of the Holocene, and an average of these (thick dark line). The records are plotted with respect to the mid 20th century average temperatures, and the global average temperature in 2004 is indicated. The inset plot compares the most recent two millennium of the average to other high resolution reconstructions of this period.
At the far left of the main plot climate emerges from the last glacial period of the current ice age into the relative stability of the current interglacial. There is general scientific agreement that during the Holocene itself temperatures have been quite stable compared to the fluctuations during the preceding glacial period. The average curve above supports this belief. However, there is a slightly warmer period in the middle which might be identified with the proposed Holocene climatic optimum. The magnitude and nature of this warm event is disputed, and it may have been largely limited to summer months and/or high northern latitudes. [1]
Because of the limitations of data sampling, each curve in the main plot was smoothed (see methods below) and consequently, this figure can not resolve temperature fluctuations faster than approximately 300 years. Further, while 2004 appears warmer than any other time in the long-term average, an observation that might be a sign of global warming, it should also be noted that the 2004 measurement is from a single year (see Image:Short Instrumental Temperature Record.png for comparison to other years). It is impossible to know whether similarly large short-term temperature fluctuations may have occurred at other times but are unresolved by the resolution available in this figure. The next 150 years will determine whether the long-term average centered on the present appears anomalous with respect to this plot.
File:Holocene Temperature Variations Rev.png - Global Warming Art
As I stated earlier, anytime you have several different models or data sets, you take the average or median - particularly when you have data-sets that represent differing scales.
You made the implication that 2100 years ago was globally warmer than today, there are no studies to support such a contention.