The amount of carbon dioxide in the atmosphere (blue line) has increased along with human emissions (gray line) since the start of the Industrial Revolution in 1750. Emissions rose slowly to about 5 billion tons per year in the mid-20^th century before skyrocketing to more than 35 billion tons per year by the end of the century. NOAA Climate.gov graph, adapted from the original by Dr. Howard Diamond (NOAA ARL). Atmospheric CO₂ data from NOAA and ETHZ. CO₂ emissions data from Our World in Data and the Global Carbon Project.