…based on a strange measurement of “PPP GDP per CO2 ton per million people”. GDP per CO2 emission gives you rough measurement of one economy's energy efficienc

…based on a strange measurement of “PPP GDP per CO2 ton per million people”. GDP per CO2 emission gives you rough measurement of one economy's energy efficiency. GDP per capita gives you rough measurement of the wealth of the economy. What does GDP per CO2 emission per capita even mean?