Fig. 1.

Percentage of cooperation (yes) per group of six subjects in each round of the climate public goods game (circles) and each round of the indirect reciprocity game (triangles). Rounds of the climate public goods game were either anonymous (open circles) or nonanonymous (filled circles). In one treatment (well-informed), the groups received additional expert information about the state of the global climate (red symbols); in the other treatment (little-informed), the groups received no additional information (blue symbols).