con ‧ ser ‧ va ‧ tion ‧ ist /ˌkɒnsəˈveɪʃ ə nəst, ˌkɒnsəˈveɪʃ ə nɪst $ ˌkɑːnsər-/ BrE AmE noun [countable]
someone who works to protect animals, plants etc or to protect old buildings
—conservationism noun [uncountable]
con ‧ ser ‧ va ‧ tion ‧ ist /ˌkɒnsəˈveɪʃ ə nəst, ˌkɒnsəˈveɪʃ ə nɪst $ ˌkɑːnsər-/ BrE AmE noun [countable]
someone who works to protect animals, plants etc or to protect old buildings
—conservationism noun [uncountable]
Longman Dictionary of Contemporary English. Longman - Словарь современного английского языка. 2012