Contrary to the oft-repeated mantra that today’s CO2 concentration is unprecedentedly high, our current levels of carbon dioxide are at near-historic lows. The average CO2 concentration in the preceding 600 million years was more than 2,600 ppm, nearly seven times our current amount and 2.5 times the worst case predicted by the IPCC for 2100. We don’t have too much … Continue reading Current CO2 levels are near record lows. We are CO2 impoverished.