The results are based on a total of 897 participants (Study 1: n = 500; Study 2: n = 397), following the pre-registered exclusion protocol displayed above. During the first five rounds of play, participants extracted on average 2.44 (SD = 1.4) points per round (see Fig. 1). They expected the average extraction behavior of their group members to be 2.92 (SD = 1.2) points per round. Thus, people extracted less than they expected others to do (exploratory paired t-test: t(897) = 12.37, p < .001). Ultimately, 496 participants were part of a group that collectively exceeded the critical threshold of 80 points. Thus, behavior in both studies resulted in a total carbon emission of 11.2 tons.