Carbon dioxide in the atmosphere of Earth

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In the atmosphere of Earth, carbon dioxide (CO2) is a trace gas that plays an integral part in the greenhouse effect, carbon cycle, photosynthesis, and oceanic carbon cycle. It is one of three main greenhouse gases in the atmosphere of Earth. In 2026, the concentration of carbon dioxide in the atmosphere reached 432 ppm or 0.0432% (on a molar basis), representing a mass of 3380 gigatonnes. This is an increase of 54% since the start of the Industrial Revolution, up from 280 ppm during the 10,000 years prior to the mid-18th century. The increase is due to human activity. The current increase in CO2 concentrations is primarily driven by the burning of fossil fuels. Other significant human activities that emit CO2 include cement production, deforestation, and biomass burning. The increase in atmospheric concentrations of CO2 and other long-lived greenhouse gases such as methane increase the absorption and emission of infrared radiation by the atmosphere. This has led to a rise in average global...

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