Fig. 2From: Influence of income difference on carbon and material footprints for critical metals: the case of Japanese householdsEquivalized carbon footprint (CF) (t-CO2eq/y) for each household income quintile in 2005. Triangles denote the carbon footprint per unit expenditure (t-CO2eq/M-JPY) for each household income quintile (corresponding to the right vertical axis)Back to article page