Atmospheric CO2 concentrations in parts per million for the
past 400,000 years.
NOAA
|
Years Before the Present |
CO2 concentration in PPM |
|
0 |
390 |
|
60 |
280 |
|
25,000 |
190 |
|
50,000 |
185 |
|
75,000 |
210 |
|
100,000 |
230 |
|
125,000 |
280 |
|
150,000 |
190 |
|
175,000 |
200 |
|
200,000 |
230 |
|
225,000 |
220 |
|
250,000 |
200 |
|
275,000 |
220 |
|
300,000 |
240 |
|
325,000 |
300 |
|
350,000 |
180 |
|
375,000 |
230 |
|
400,000 |
280 |
|
|
|
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