Here's an article from Canada's famously conservative
National Post as an example
The Ice-Core ManOnce upon a time, and for millennia before then, carbon dioxide levels in the atmosphere were low and stable. Then came the industrial revolution and CO2 levels began to rise. The more man industrialized, the more that CO2 -- and the temperature -- rose....
This story is a fable, says Zbigniew Jaworowski, past chairman of the United Nations Scientific Committee on the Effects of Atomic Radiation, a participant or chairman of some 20 Advisory Groups of the International Atomic Energy Agency and the United Nations Environmental Program, and current chair of the Scientific Committee of the Central Laboratory for Radiological Protection in Warsaw....
"The IPCC relies on ice-core data -- on air that has been trapped for hundreds or thousands of years deep below the surface," Dr. Jaworowski explains. "These ice cores are a foundation of the global warming hypothesis, but the foundation is groundless -- the IPCC has based its global-warming hypothesis on arbitrary assumptions and these assumptions, it is now clear, are false."
More
here And here's a rebuttal (in a LTTE) to Jaworowski's contentions in the journal
Environmental Science and Pollution Research by none other than Hans Oeschger. This particular file is a
PDFHere's the final paragraph of Oeschger's letter (boldfacing is mine):
The study of the history of Earth system parameters is an on-going process; an increasing number of laboratories have become involved and interact with each other. As it is the case in any field of science, the state of art is continuously critically assessed and attempts are made to improve the quality of the research. Ice-core information is fundamental for the assessment of one of the most urgent problems of our time. Based on my experience during decades of involvement in this field, I consider the chances as very small that the major findings from greenhouse gas studies on ice cores are fundamentally wrong; and I find the publications of JAWOROWSKI not only to be incorrect, but irresponsible.
Hope this helps. Thanks so much for your videos. They're terrific.