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We don't have 100 years of data, but we do have 20 years of data, with data going back much farther through proxy data. We can create a pretty good guess back 100 years because we have records of CO2 since 1957, and better proxy records of CO2, which is strongly tied to oxygen.

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Q: What is the atmospheric oxygen concentration on earth over the last 100 years as a function of time?
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