SUMMARY - Metrics, Data, and Monitoring Biodiversity Loss
You can't manage what you don't measureābut measuring biodiversity presents formidable challenges. Species counts are incomplete; most species remain undescribed. Population trends are known for only a fraction of known species. Ecosystem health is harder to quantify than species lists. The data gaps are enormous, yet decisions affecting biodiversity can't wait for perfect information. Monitoring systems are improving, but the gap between what we know and what we need to know remains vast.