WHAT IS THE TRUE HISTORIC RECORD OF CO2 LEVELS IN OUR ATMOSPHERE?

There are many weak links in the chain that supports the catastrophic man made global warming hypothesis. One is that CO2 is now at record high levels in the atmosphere when compared with a very long period of tens of thousands of years. Here is an interesting article on Watts Up With That which looks at the evidence to support this idea. I recommend reading the comments as some of them seem to be well informed and add extra information to the subject. When you look at the evidence, one thing that jumps out is that it is certainly not strong, which is what is expected when trying to reconstruct the composition of our atmosphere such a long way back.