Participation and Collective Harm

Many global problems nowadays are collective action problems. It is only because many people act in some way that certain problems arise (e.g., climate harms). But when can one be said to participate in such groups in the first place? As Derek Parfit asked, “When we appeal to what groups together do, whom should we count as members of these groups?” As Julia Nefsky has shown, this problem has proven to be notoriously tricky, and without any adequate solution. We present a solution. The proposed account not only overcomes a number of problems for participation-based views, according to which it is morally problematic to participate in such groups at all, but also helps make precise a prominent alternative view, according to which one should help bring about better outcomes.