Atmospheric concentrations of carbon dioxide have been steadily rising, from approximately 315 ppm (parts per million) in 1959 to a current atmospheric average of approximately 385 ppm (Keeling et al.

Over the last 150 years, humans have emitted over 2,000 gigatons of carbon dioxide (CO2) into the atmosphere, increasing the CO2 concentration by 50 ...

Peaks in CO2 concentrations have historically coincided ... a significant contributor to global warming alongside feedback mechanisms such as water vapor and deforestation. While models have ...