The Human Contribution to Atmospheric Carbon Dioxide

Abstract: Since the beginning of the Industrial Revolution in the late 1700s, the average concentration of Earth's atmospheric carbon dioxide (CO₂) has increased by about 140 parts per million by volume (ppmv) to the current amount of about 420 ppmv. This is much higher than concentrations of the past 800,000 years, which rarely exceeded 300 ppmv, according to ice core data. In this document, the CO₂ Coalition presents multiple lines of scientific evidence demonstrating conclusively that the modern increase in CO₂ is mainly due to anthropogenic emissions.