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Why should we look at pollution per GDP? I'd contest that pollution per capita is a more humanistic, less capitalistic view, and helps contextualize some geographic features better than GDP.

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If your concern is efficiency of production, than pollution per unit of GDP is valid. If you want fairness based on population, then you can look at pollution per person, but that metric won’t really tell you how/where things can be improved.

What it does show is that China’s CO2 use is mainly industrial while in America it is much more personal

Seems like an absurd measure when comparing service versus production driven economies. GDP doesn’t measure whether you sold 1 million copies of a film, or manufactured the cameras out of raw materials to produce them. Obviously one has a significantly more linear relationship to carbon output than the other.

If it's geographically, then don't account per capita. Account absolute values per country.

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