I really don't think you do. Therefore, I'm going to take the word of the multiple peer review papers in highly regarded journals.
Can you please link what you're referring to? The Vostock ice core data confirms unprecedented CO2 levels. There was a temperature lag yes, however this in no way contradicts the fact that CO2 causes warming. Please do some reading on how to draw conclusions from data. There is more than one way to heat a house. There is proof CO2 heats up the atmosphere (unless you deny basic physics also?). Drawing from this I hope you see the flaw in citing the Vostock cores.
