This is just embarrassing. It basically assumes away the results.
Methods:
"We start with national consumption emissions data for 117 countries from 1990 to 2015 period. This reflects both the emissions produced in a country and those embedded in imports, while excluding those embedded in exports. We allocate national consumption emissions to individuals within each country based on a functional relationship between income and emissions, drawing on new income distribution datasets.
We assume, based on numerous studies at national, regional and global levels, that emissions rise in proportion to income, above a minimum emissions floor and to a maximum emissions ceiling. These estimates of the consumption emissions of individuals in each country are then sorted into a global distribution according to income."