Figure 2
From: Urban green space and happiness in developed countries
The effect of GDP on the green-happiness relation. (a), (b) The relations of (a) log-GDP and happiness, and (b) urban green space (i.e., UGS) and happiness across 60 developed countries. The top 30 and the lower 30 countries ranked by GDP are sized by the population size and colored by red and black. The dotted lines are the linear fit for each GDP group. (c) Changes of coefficients between urban green space and happiness for different sets of GDP rank with increasing window size from top 10 to 60. (d) The rank correlations between the UGS and happiness for the groups of increasing countries in the GDP rank order