Why Leave the Car at Home, If That Doesn’t Save the Climate?

Why take individual action against collectively caused evils such as climate change? Prima facie, one’s individual contribution may seem to make a negligible difference at best. Consequentialists as well as consequence-sensitive nonconsequentialists should be interested in whether a consequence-based justification for taking individual climate action can be found nonetheless. The author argues that even though individual agents are able to make a non-zero difference in expectation, the altruistic expected value may be so small as to be insufficiently worthwhile, given the agents’ opportunity cost. In this case, altruistic agents may face a Prisoner’s Dilemma (PD), i.e. an altruistic public goods problem. Hence, the consequence-based account of why to leave one’s car at home could be vindicated if the PD can be solved in a consequence-based way. The author offers tentative grounds for optimism about solving the PD in a consequence-based way, and for acting accordingly.