The warming that began 20,000 years ago that raised temperature 8 degrees that melt the ice that covered northern USA and all of Canada continues and has nothing whatsoever to do with CO2
Frank- we all know that. people are concern about what is happening now, at the surface of the earth. climate has always changed, that is a given. the increase in CO2 recently is different. can it, has it made more than a trivial difference? who knows but we should find out. just not with climate models that are programmed to find CO2 as a major factor.