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Portable Network Graphic  |  1991-05-30  |  3KB  |  512x342  |  4-bit (4 colors)

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OCR: 5.0- Carbon, x109 metric tons/yr 2.5- 0.04 1890 1910 1930 1950 1970 1990 MAN'S PRODUCTION OF CARBON DIOXIDE Year 350- Atmospheric CO2 in ppm 340 330 320 310+ 1960 1970 1980 1990 MEASURED CARBON DIOXIDE LEVELS YEAR

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