Figure 3.

Distribution of reviewed studies by country and climatic region. a) Number of studies reviewed by country. To synthesize the data, countries with the same number of studies were grouped (Groups 1 to 5). For example, Group 1 includes Spain and Brazil, with six studies each, totaling 12 studies. Group composition is described in the box (in parentheses, the number of studies per country). Dark and light orange bars represent the number of studies per country and the total number of studies per group, respectively. The numbers above the bars represent the number of studies per country or group of countries. b) Map of global distribution of studies on active revegetation after mining. Climatic regions follow Köppen classification (Köppen, 1936) (N = 203).