Wise use of natural resources.
The discipline concerned with protection of biodiversity, the environment, and natural resources
The protection and care of cultural heritage, including artwork and architecture, as well as historical and archaeological artifacts
The act of preserving, guarding, or protecting; the keeping (of a thing) in a safe or entire state; preservation.
Genes and associated characteristics of biological organisms that are unchanged by evolution, for example similar or identical nucleic acid sequences or proteins in different species descended from a common ancestor
lack of change in a measurable property of an isolated physical system (conservation of energy, mass, momentum, electric charge, subatomic particles, and fundamental symmetries)
A means or route for transporting indispensable supplies.
A particular crease in the palm.
A line from the diver to a tender at the surface control point.
A line to which a drowning or falling victim may cling.
System or structure of vital importance to a community.
A source of salvation in a crisis.
On the deck of a boat, a line to which one can attach oneself to stay aboard on rough seas.