About how many parts per million (ppm) of carbon dioxide were in the atmosphere in... 1959? Student response 1975? Student response. 1985? Student response. 1995? Student response. 2019? Student response
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About how many parts per million (ppm) of carbon dioxide were in the atmosphere in...
1959? Student response
1975? Student response.
1985? Student response.
1995? Student response.
2019? Student response.
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