Global warming activists argue carbon-dioxide emissions are destroying the planet, but the climate impacts of carbon dioxide are minimal, at worst. Activists would also have you believe fossil-fuel emissions have driven carbon-dioxide concentrations to their highest levels in history. The Obama-era Environmental Protection Agency went so far as to classify carbon dioxide as a toxic pollutant, and it established a radical goal of closing all of America’s coal-fired power plants.
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.
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