Fig. 4: Scatterplot of \({D}_{r}^{K}\) and. \(HD{I}_{r}\) with a quadratic regression fit.
From: Urban and non-urban contributions to the social cost of carbon

Blue circles represent the relationship between projected climate change economic impacts (\({{{{\boldsymbol{D}}}}}_{{{{\boldsymbol{r}}}}}^{{{{\boldsymbol{K}}}}}\)) and the Human Development Index (\({{{{\boldsymbol{HDI}}}}}_{{{{\boldsymbol{r}}}}}\)) across 140 countries. The red line shows the fitted quadratic regression curve.