Data collected from ice cores, shows us that CO2 levels have been below 300 parts per million (ppm) for over 800,000 years. We are currently at almost 390ppm. Dr. James Hansen of NASA stated “If humanity wishes to preserve a planet similar to that on which civilization developed and to which life on Earth is adapted, paleoclimate evidence and ongoing climate change suggest that CO2 will need to be reduced from its current 385 ppm to at most 350ppm.”
Above 350ppm of CO2 in the atmosphere w...