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Glad you asked. A country is an arbitrary set of lines on a map, isn't it? A person is a discrete object, and for statistical purposes, roughly equivalent. That's why a ratio-scale of per capita is statistically more meaningful.
If Vatican City had the highest per capita energy production, it would still be insignificant in practice.
Why is that insignificant? By what measure?
I would argue that would be an interesting data point.(e.g What would cause that? Why are the people there doing that? How would people in the Vatican who worry about climate change know there's an issue otherwise? Etc?)
A previous poster said (correctly) that Canadians, per capita produce more GHGs. That's important information.
That's an interesting take on that comparison. I'm not sure the people of Hong Kong, Taiwan, or Tibet would necessarily agree with that portrayal of China.
Why? Let's say this was still the example... Couldn't the reach of the Vatican and its billions of followers make a meaningful impact?