Now you show me a graph claiming to know the amount of co2 thousands and thousands years ago.
But let's assume your estimate of the amount of co2 was accurate thousands and thousands of years ago:
Nasa came to the general conclusion in their study that the sun may have played a dominant role in pre-industrial climate change (from 1600 to 1800, for example) but it has not played a significant part in long-term climate change during the past few decades.
In other words, like Nasa said, Solar output had a very significant relationship in those little glacial ages that you showed in your graph from thousands and thousands years ago. Low solar output=extreme cold.
Then we have a similar conclusion from the National Academy of Sciences of the US:
The evidence of periods of several centuries of cooler climates worldwide called "little ice ages," similar to the period anno Domini (A.D.) 1280-1860 and reoccurring approximately every 1,300 years, corresponds well with fluctuations in modeled solar output.
Now look at this graph and note how solar output is decreasingly having an effect in global warming, suggesting that man-caused greenhouse gases such as co2 emissions are the problem:
