This document discusses ways to promote on-farm biodiversity. It finds that agricultural intensification has led to widespread declines in farmland species. Organic farming supports 30% more species than conventional farms, especially for plants. The most effective ways to promote biodiversity include using hedgerows, non-crop habitat, and supporting pollinators through limiting insecticides and planting diverse flowers. However, the relationships between biodiversity and ecosystem functions are complex. While greater predator diversity can suppress pests, the economic benefits of pollinator diversity are unclear.