Human Contribution to Atmospheric CO2: How Human Emissions Are Restoring Vital Atmospheric CO2
Ferdinand Engelbeen, Renee Hannon, and David Burton
December 2024
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.
Just as we can say with great confidence that the increase in atmospheric CO2 is primarily from human emissions, we are equally confident that more CO2 will not be harmful. Rather, widely available evidence supports the CO2 Coalition’s stance that increasing CO2 is greatly beneficial for Earth’s ecosystems and humanity.
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