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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