The Earth's Natural Climate Change Experiment

The Earth conducted an experiment over the past three million years that charted climate change against atmospheric CO2. After comparing glacial and interglacial periods to CO2 levels, Earth’s finding was that there was no correlation. Several interglacials were noted that were warmer with much higher sea levels than the Holocene interglacial with atmospheric CO2 levels of 280ppm. Slightly lower CO2 levels were noted during glacial periods which ended before CO2 levels increased moderately. For the past three million years interglacials began when CO2 was low and ended when CO2 was higher. 

The same proved true for shorter periods since 1900; temperature rose rapidly from 1920 to 1940 with little or no change in CO2 from 280ppm. Then as CO2 rose rapidly after 1940, global temperature fell rapidly until 1980. The rise in both temperature and CO2 from 1980 to 2000 was followed by a pause in temperature increase that persisted almost twenty years while CO2 continued to steadily rise. 

Looking at just the past 10,000 years, Greenland ice core and lake and ocean sediment cores show we now live in the coldest 1,000-year period of the past 10,000 years, and that the greatest warming and corresponding higher sea levels were found 6,000 to 8,000 years ago during the Holocene Climate Optimum. The following three warming periods before the present – Minoan, Roman, and Medieval – were each cooler than its predecessor and current warming is the coolest of all. 

Proof of warmer periods in the past 10,000 years are also evidenced by ancient tree lines further north and at higher altitudes, coral mounts several feet above current sea level, and ancient beaches above present ones. 

Thousands of studies exist that prove earlier warming was significantly higher and globally distributed. The Earth gives evidence that none of the models can refute.