Atmospheric CO₂ concentrations began their most recent steep increase about A) 5000 B.C. B) 1000 B.C. C) 1400 A.D. D) 1800 A.D. E) 1950 A.D.

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The anthropogenic (human-caused) increase in atmospheric CO₂ concentrations began in earnest with the industrial revolution in the late 1700s and early 1800s, as human activities such as the burning of fossil fuels released large amounts of the gas into the atmosphere. This has been confirmed by ice core and other geological records.

Atmospheric CO2 Concentrations Began Their Most Recent Steep Increase About

Atmospheric CO₂ Concentrations Began Their Most Recent Steep Increase About