CO2 levels are now around 387ppm, which is much higher than the natural cycle.
One of the things people noticed after Al Gores movie "An Inconvenient Truth" is that in the natural cycle CO2 lags behind warming. This is actually true.
Here is how it works:
The Milankovitch Cycles are the main regulator of the longer term natural cycle forcing that pushes us in and out of ice ages and warm periods (glacial/inter-glacial).
Natural v. Human Caused?
In the natural cycle, the Milankovitch cycles lead the change and most everything else follows.