We design a lab experiment based on a static threshold public goods game with endowment heterogeneity and team delegation. Using a two-by-two between-subjects design, we examine the effects of heterogeneous versus homogeneous team endowments, as well as the impact of delegate selection through elections versus random assignment. In addition, we analyze how these two dimensions influence the success rate and efficiency of public goods provision, as well as equilibrium selection. Our experiment sheds light on the roles of wealth inequality and political institutions in global climate cooperation.