Environmentalist

/ɪnˌvaɪrənˈmɛn(t)əlɪst/

Synonyms

  • ecologist
  • conservationist
  • green activist
  • nature lover

Slang Meanings

tree-hugger
Some people call her a tree-hugger because she fights for forest preservation.
greenie
He got called a greenie for always promoting eco-friendly practices.