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Few thousand years ago the world's population was below 3 million, spread over huge areas. How much of an impact would such a population size have on a grand scale!? The carbon dioxide levels can have other sources such as volcanic eruptions and there are quite a few large eruptions that have occured in prehistory. Scientists still find it hard to believe that we are causing climate change today, with our ecological footprint being thousands of times larger than it was 5-8 thousands of years ago. I would argue that it is a very bold and unsupported theory, that humans had such large effects on world's climate thousands of years ago. However, I think that forest fires could be a large enough reason for increase of carbon dioxide concentration. If these forest fires were cause by humans, I can agree to some extent with the above theory.
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