Communities hold roughly half the world's land by custom but only about a tenth by law. The finale ties the series together through that security gap, the twenty-first-century land rush, women's land rights, and the pressure of carbon markets and conservation. It closes on the series' diagnostic: to understand a society, ask what rules it wrote for the ground under its feet.
The customary-land share is an estimate with real methodological disagreement, and no genuinely current global figure exists. Whether titling protects people, whether carbon and conservation deals help or harm tenure, and whether soft law changed outcomes are also contested.