And finally, during the present day natural mega global warming cycle as seen in Figure 13, carbon dioxide concentrations began much higher at 262 ppm 6,000 to 10,000 years before present, as compared to 190 to 200 ppm for the other cycles. Thus indicating the current cycle leading up to the crest began much warmer than the 3 other cycles, and this allowed the natural carbon dioxide feedback system to accelerate for a longer period of time, enabling carbon dioxide concentrations to reach near 400 ppm, and likely very similar to the warm cycle over 400,000 years ago.
Figure 13: A 49 percent natural increase of carbon dioxide from 262 ppm to 385 ppm occurred during a 6,000 to 10,000 year period leading up to the peak of the current natural 116,000 year temperature peak. Data derived from the Lake Vostok ice core samples from 6.220 to 100 years before present, instrument records from 1902 AD to 2008 AD. (click image to enlarge)
The conclusion from a study of the 4 tables in Figures 10-13 indicate that all 4 mega 116,000 year global warming cycles during the past 333,000 years showed an increase of 44 to 51%, and this includes the current cycle at 49%. The only difference in the current cycle is that carbon dioxide levels and temperatures were naturally higher 10,000 years prior to the crest of the cycle, thus indicating a natural very warm cycle.
It is also concluded that the percentage increase in carbon dioxide ppm during the 10,000 years leading up to the crest of the current mega warming cycle, is within the mean values of the other 3 “natural” mega global warming-carbon dioxide cycles, and that the present day 385 ppm is not caused primarily by the industrial emissions of carbon dioxide, but rather by the natural cycles discussed herein.
By using this knowledge of past climates and the historical extent of ice cover, it can be hypothesized that if the atmospheric temperatures 425,000 years ago were as warm as today and that carbon dioxide is a following gas caused by a natural feedback response to warmer temperatures, and it is also likely that carbon dioxide concentrations were similar to present day readings. Therefore it is hypothesized that the present day carbon dioxide levels are within the natural envelope experienced during mega warming cycles occurring approximately every 425,000 to 460,000 years.
Although some may maintain that temperatures and the carbon dioxide ppm levels of the current cycle are higher than the other 3 natural mega cycles, remember that just 4 mega cycles prior to this current one, the depth of ice over lake Vostok in the Antarctic was nearly void, thus indicating a cyclical melting some 425,000 to 460,000 years ago, much like what we are seeing today.
The upcoming sections will discuss the 7 different natural global warming cycles which range from 450,000 years all the way down to 10 year periods, and demonstrate that every 4thglobal warming master and sub cycles are the strongest and warmest, and show why temperatures and carbon dioxide have increased so dramatically since 1930, and are similar to the very warm mega cycle 425,000 to 460,000 years ago.