It shows the Keeling curve, an interactive record of atmospheric carbon dioxide levels going back 800,000 years. You can click along the bottom to select various time-spans to display. Select the one-year or two-year options and you will see the seasonal variations due to uptake and release by plant life. Full explanation here http://keelingcurve.ucsd.edu/why-are-seasonal-co2-fluctuations-strongest-in-northern-latitudes/
Select 1700-present for a very convincing and worrying graph!
The older data is extrapolated from ice cores, the most recent data is from live atmospheric observations.
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