The effective altruism movement has identified animal welfare as one of the most cost-effective ways to reduce suffering in the world. Understanding this approach helps identify where action has the most impact.
The application of effective altruist thinking to animal welfare illuminates both the enormous scale of the problem and the high cost-effectiveness of some interventions. Corporate campaign advocacy — where organisations persuade major food companies to adopt higher welfare policies — has produced measurable improvements for very large numbers of animals per dollar spent. The cage-free egg transition driven largely by corporate advocacy involved hundreds of millions of hens, achieved at a fraction of the cost of equivalent improvements through legislative lobbying. EA approaches also highlight the importance of prioritisation: with limited resources, interventions targeting the largest-suffering populations (factory farmed animals), using the most evidence-supported methods (corporate campaigns, institutional reform), and with the strongest cost-effectiveness evidence deserve prioritisation. The application of EA analysis to wild animal welfare and fish welfare is less developed but growing — the potential scale of interventions addressing wild animal suffering and the billions of farmed fish annually suggests these may be neglected priority areas. Consumer engagement, research, and institution-building all feature in the EA animal welfare portfolio.