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I was recently discussing climate change with a friend and was surprised (and embarrassed) to learn that the heat capacity of CO${}_2$ is not higher than that of nitrogen contrary to my assertions. After further research, I found that the relevant capture cross sections account for the greenhouse effect.

I wanted run some calculations, but, while I know how to determine the cross sections of elements and compounds, I don't know what the average spectrum of Earth's albedo is.

Where can I find this information? What is the average spectrum of Earth's albedo?

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There CERES satellite has been measuring light reflected from Earth. In principle the raw data is available from NASA though I imagine some work will be necessary to process it.

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