con·ser·va·tion·ist

[kon-ser-vey-shuh-nist]
noun
a person who advocates or promotes conservation, especially of natural resources.

Origin:
1865–70; conservation + -ist

an·ti·con·ser·va·tion·ist, noun
pro·con·ser·va·tion·ist, adjective, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins
World English Dictionary
conservationist (ˌkɒnsəˈveɪʃənɪst) [Click for IPA pronunciation guide]
 
n
a person who advocates or strongly promotes preservation and careful management of natural resources and of the environment

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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00:10
Conservationist is always a great word to know.
So is lollapalooza. Does it mean:
a gadget; dingus; thingumbob.
an extraordinary or unusual thing, person, or event; an exceptional example or instance.
Etymonline
Word Origin & History

conservationist
1870, from conservation. The ecological sense is from 1922.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
The duke was a leading conservationist and the deer were never hunted.
However, after your words of revelations it might be conceived to some that you
  are mocking conservationist aka greenies.
Conservationist tenant preferred, but extractive forestry also considered.
Masked in the environmentalist and conservationist movement is a redistribution
  of wealth.
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