If CO2 makes up such a small percent of the atmosphere, why are CO2 emissions such a concern? - Quora
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Carbon dioxide now more than 50% higher than pre-industrial levels | National Oceanic and Atmospheric Administration
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Trends in atmospheric concentrations of CO2 (ppm), CH4 (ppb) and N2O (ppb), between 1800 and 2017 — European Environment Agency
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