planned management of natural resources to maintain value and contributions. prevent exploitation. destruction. or neglect. and minimize negative impacts from human activity.

Merriam-Webster Online Dictionary
conservation (noun)
a careful preservation and protection of something , especially planned management of a natural resource to prevent exploitation, destruction, or neglect
the preservation of a physical quantity during transformations or reactions
conservation (Wikipedia)

Conservation is the preservation or efficient use of resources, or the conservation of various quantities under physical laws.

Conservation may also refer to:

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