Concentration Of CO2 In The Air Has Risen Dramatically Since Late 19th Century From Below 300 Parts Per Million To Above 400 Parts Per Million, With The Largest Jump In The Last 70 Years
CO2 levels in the air have risen dramatically since the late 19th century, from below 300 ppm (parts per million) to well over 400 ppm in the last 150 years. The Keeling Curve, which tracks CO2 concentration levels in the air, utilizes readings from frozen ice cores in glaciers before 1958. Continuous air measurements began at an observatory in Hawaii (Mauna Loa) in 1958.
2016 global average surface temperatures were also the warmest since modern record keeping began in 1880, with 16 of the 17 warmest years on record occurring since 2001.