stewardship
[ stoo-erd-ship, styoo- ]
/ ˈstu ərd ʃɪp, ˈstyu- /
noun
the position and duties of a steward, a person who acts as the surrogate of another or others, especially by managing property, financial affairs, an estate, etc.
the responsible overseeing and protection of something considered worth caring for and preserving: New regulatory changes will result in better stewardship of lands that are crucial for open space and wildlife habitat.