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The concentrations of carbon dioxide in the atmosphere are expressed as parts per million by volume (abbreviated as ppmv, or ppm(v), or just ppm). To convert from the usual ppmv units to ppm mass (abbreviated as ppmm, or ppm(m)), multiply by the ratio of the molar mass of CO 2 to that of air, i.e. times 1.52 (44.01 divided by 28.96).
Atmospheric carbon dioxide (CO 2) concentrations from 1958 to 2023. The Keeling Curve is a graph of the annual variation and overall accumulation of carbon dioxide in the Earth's atmosphere based on continuous measurements taken at the Mauna Loa Observatory on the island of Hawaii from 1958 to the present day.
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English: This figure shows the history of atmospheric carbon dioxide concentrations as directly measured at Mauna Loa, Hawaii since 1958. This curve is known as the Keeling curve , and is an essential piece of evidence of the man-made increases in greenhouse gases that are believed to be the cause of global warming .
Uploader generated most of SVG code with the Horizontal bar charts spreadsheet from User:RCraig09/Excel to XML for SVG; minor moves and nudges were performed manually on the SVG code. A similar graphic, but including greenhouse gases and not only CO₂, was uploaded 28 Dec 2021 at File:20211228 Cumulative greenhouse gas emissions by country and ...
0.1 × ( 12 ÷ 8 ) = 0.15 grain per dscf when corrected to a gas having a specified reference CO 2 content of 12 volume %. Notes: Although ppmv and grains per dscf have been used in the above examples, concentrations such as ppbv (i.e., parts per billion by volume), volume percent, grams per dscm and many others may also be used.
Updates atmospheric CO2 from 350 ppm to 387 ppm and CH4 from 1745 ppb to 1790 ppb (values for 2009, other values were seriously out of date) 13:48, 28 September 2008 180 × 375 (27 KB)
Version 3 (2021-12-30): Published emissions data from Global Carbon Atlas, population from Britannica, and calculated tons per person: Country TCO2 population T/pp Saudi Arabia 626 36.8 17.0 Australia 392 25.9 15.1 USA 4,713 335.0 14.1 Canada 536 38.1 14.1 South Korea 598 51.7 11.6 Russia 1,577 143.0 11.0 Iran 745 85.0 8.8 Japan 1,031 125.0 8.2