Conservation means that a product or resource is used only when needed, and is not wasted. Energy conservation means that steps are being taken to save on wasted energy, to conserve and keep extra energy to use in the future.
Yes, conserve can mean to save or protect something, typically in order to preserve it or prevent waste.
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Sparingly is an adverb that means to use a small amount, or to conserve something.
Conserve
Why should you conserve wildlife?
To conserve the environment.
we have to conserve water to save our planet
conservation of forest means to protect our forest
The opposite of conserve would be to squander or waste.