 |
Activity 4: Keeling's Data, 1970-76*
Month:
|
1970
|
1971>
|
1972>
|
1973>
|
1974>
|
1975>
|
1976>
|
January>
|
325.03>
|
326.17>
|
326.77>
|
328.54>
|
329.35>
|
330.40>
|
331.74>
|
>February
|
325.99
|
326.68
|
327.63
|
329.56
|
330.71
|
331.41
|
332.56
|
March
|
326.87
|
327.18
|
327.75
|
330.30
|
331.48
|
332.04
|
333.50
|
April
|
328.13>
|
327.78>
|
329.72>
|
331.50>
|
332.65>
|
333.31>
|
334.58>
|
May
|
328.07
|
328.92
|
330.07
|
332.48
|
333.09
|
333.97
|
334.87
|
June
|
327.66
|
328.57
|
329.09
|
332.07
|
332.25
|
333.60
|
334.34
|
July>
|
326.35>
|
327.34>
|
328.05>
|
330.87>
|
331.18>
|
331.91>
|
333.05>
|
>August
|
324.69
|
325.46
|
326.32
|
329.31
|
329.40
|
330.06
|
330.94
|
September
|
323.10
|
323.36
|
324.93
|
327.51
|
327.43
|
328.56
|
329.30
|
October>
|
323.16>
|
323.56>
|
325.06>
|
327.18>
|
327.37>
|
328.34>
|
328.94>
|
>November
|
323.98
|
324.80
|
326.50
|
328.16
|
328.46
|
329.49
|
330.31
|
December
|
325.13
|
326.01
|
327.55
|
328.64
|
329.57
|
330.76
|
331.68
|
*monthly average concentrations of atmospheric carbon dioxide (ppm) at Mauna Loa
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