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You spelled it correctly; altruistic. Assuming, that is, that 'altruistic' is the word you intend.
Altruistic is an adjective.
Altruistic preservation is a philosophy of preserving nature for its own sake.
The person and their attitude promotes altruistic behavior.
An altruistic person is unselfishly concerned for or devoted to the welfare of others. For example, Mother Theresa was an altruistic person, some say.