2NLC academia adequate sustainable housing Africa ancestral land architecture archive Asia bibliography biodiversity Cambodia campus cities citizenship civil society climate change climate resilience communal communal land community finance constitution cooperation costs customary dryland ecosystems education EFN energy erosion ESJT GIZ green hydrogen green spaces gully housing human rights implementation plan inclusive indigenous rights informal areas informal settlements informal settlement upgrading informal structures land land reform livelihoods murd namibia nhag opportunities policy research rural sdfn Southern Africa urban urban development urbanisation Windhoek