CannotResolveSymbol wrote:
I find this EPA graph interesting:

Figure 1. This graph shows fluctuations in temperature and in the atmospheric concentration of carbon dioxide over the past 400,000 years as inferred from Antarctic ice-core records. Temperature and carbon dioxide concentrations vary roughly in tandem over the period, with corresponding peaks and troughs. At the end of the period there is a very sharp increase in atmospheric carbon dioxide levels, representing the rapid increase over the past two centuries.

Figure 1: Fluctuations in temperature (blue) and in the atmospheric concentration of carbon dioxide (red) over the past 400,000 years as inferred from Antarctic ice-core records. The vertical red bar is the increase in atmospheric carbon dioxide levels over the past two centuries and before 2006. From A. V. Fedorov et al. Science 312, 1485 (2006)17. Exit EPA Disclaimer18. Reprinted with permission of AAAS19* Exit EPA Disclaimer18.

Hmm...  looks periodic.

<snip>


Here:  I made it a bit more obvious: