The studies involve a common-resource dilemma – in which a negative environmental externality is triggered depending on the group's collective decision-making. Our findings show that while first-order climate change beliefs weakly predict pro-environmental behavior, second-order climate change beliefs do not correlate with participants' choices when accounting for first-order climate change beliefs. However, beliefs about others' behavior strongly predict people's choices. We discuss the results in terms of the role different types of beliefs play in environmental decision-making.