CO2 levels in atmosphere rising
To the Journal editor: For most of our Earth’s history, carbon dioxide (CO2) levels in the atmosphere have ranged between 180 and 280 parts per million. When CO2 levels where around 280 parts per million, the corresponding Earth temperature could sustain life. When CO2 levels where around 180 parts per million were times of ice ages. For the first time in the history of Earth, CO2 reached 300 ppm in 1950. Today CO2 levels have reached 425 PPM. A 42% increase in just 75 years! An unheard-of rate of change to a level our world has never experienced. Carbon dioxide in the Earth’s ...