“Claims of unprecedented carbon-dioxide levels ignore most of Earth’s 4.6-billion-year history. Relative to Earth’s entire record, carbon-dioxide levels are at historically low levels; they only appear high when compared to the dangerously low levels of carbon dioxide that occurred in Earth’s very recent history. The geologic record reveals carbon dioxide has almost always been in Earths’ atmosphere in much greater concentrations than it is today. For example, 600 million years ago, when history’s greatest birth of new animal species occurred, atmospheric carbon-dioxide concentrations exceeded 6,500 parts per million (ppm) — an amount that’s 17 times greater than it is today [...] There are periods in Earth’s history when carbon dioxide concentrations were many times higher than they are today, yet temperatures were identical to, or even colder than, modern times. The claim that fossil-fuel emissions control atmospheric carbon-dioxide concentrations is also invalid, as atmospheric concentrations have gone up and down in the geological record, even without human influence.”