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Portable Network Graphic  |  1992-02-05  |  2.1 KB  |  512x342  |  1-bit (2 colors)
   ocr: - FE - - - Carbon, x1D9 metric tons/yr 5.07 2.51 0.0F 1890 1910 1930 1950 1970 1990 Year MAN'S PRUDUCTIUN OF CARBON DIOXIDE 350- Atnospher: ic CO2 in ppn 3401 330-1 320- 310+ 1960 1970 19B0 1990 YEAR NEASURED CARBON DIOKIDE LEUELS