Figure 2

Group investments collected over ten rounds (dots) and their empirical frequency distribution (violins, in intervals of €3), for treatments T1 (blue), T2 (green), and T3 (brown). The frequency distribution is derived using non-parametric kernel density. Larger dots represent duplicate outcomes. The dashed lines represent the 2°C climate target at a target sum of €120 and the 3°C focal point at an additional focal point at €80.