Preservation
Part of speech: noun
Definition: The act of preserving; care to preserve; act of keeping from destruction, decay or any ill.
Example sentence: The practical importance of the preservation of our forests is augmented by their relations to climate, soil and streams.
Conservation
Part of speech: noun
Definition: The act of preserving, guarding, or protecting; the keeping (of a thing) in a safe or entire state; preservation.A wise use of natural resources.
Example sentence: Steve Irwin did wonderful conservation work but I was uncomfortable about some of his stunts. Even if animals aren't aware that you are not treating them with respect, the viewers are.