The scary part in that chart is not the peak, it's the ice age that comes after. And lasts longer.
Mrs VS
Looks like CO2 content of the atmosphere is driven by temperature.
The sun and actual science marches onward not standing still for even Global Warming theory.
Solar Resonant Diffusion Waves as a Driver of Terrestrial Climate Change
Authors: Robert Ehrlich
Comments: in press with The Journal of Atmospheric and Solr Terrestrial Physics
http://arxiv.org/abs/astro-ph/0701117v1A theory is described based on resonant thermal diffusion waves in the sun that appears to explain many details of the paleotemperature record for the last 5.3 million years. These include the observed periodicities, the relative strengths of each observed cycle, and the sudden emergence in time for the 100 thousand year cycle. Other prior work suggesting a link between terrestrial paleoclimate and solar luminosity variations has not provided any specific mechanism. The particular mechanism described here has been demonstrated empirically, although not previously invoked in the solar context. The theory also lacks most of the problems associated with Milankovitch cycles.