The graphs represent data taken from ice core samples.From these CO2 levels and temperatures long ago can be inferred.
No one is doubting the warming but it (at least to me) seems fantastically unlikely that man made CO2 is the major cause.I posted the graph to show that from historical precedent the Earth was due to warm up anyway.From the graph it appears that about every 100000years there is a temperature peak and that's what we're approaching now.It would have happened if the planet was uninhabited,it started warming up about 20000 years ago and if past trends are continued we still have a few degrees more to go.
Also note that CO2 levels follow the temperature changes which seems to suggest it's more of a consequence than a cause..
Lets just say we agree to dis-agree I guess.I still think you would have a very hard time finding many objective scientists that think its not as I have said.