Monarch butterfly populations have declined by over 80% in recent decades due to habitat loss, pesticide use, and climate change, raising concerns about pollinator welfare and ecosystem health.
While insect sentience remains scientifically debated, the ecological and ethical case for monarch conservation is compelling. Monarchs play important roles as pollinators and as indicators of ecosystem health. Their dramatic decline reflects broader insect population collapse that threatens food systems and biodiversity. For those who accept that insects may have some capacity for suffering, the mass mortality caused by pesticide exposure represents a welfare concern at enormous scale. Regardless of sentience questions, restoring monarch populations requires systemic changes to agricultural pesticide use, habitat management, and climate policy. Individual gardens can make a meaningful contribution to population recovery.