conservationists

/K AA0 N S ER0 V EY1 SH AH0 N IH0 S T S/
noun
  1. 1

    A person who maintains natural areas or protects threatened species.

  2. 2

    Someone who advocates for these actions.

Source: https://en.wiktionary.org/wiki/conservationist, https://en.wiktionary.org/wiki/conservationists