an expert on environmental problems.
any person who advocates or works to protect the air, water, animals, plants, and other natural resources from pollution or its effects.
a person who believes that differences between individuals or groups, especially in moral and intellectual attributes, are predominantly determined by environmental factors, as surroundings, upbringing, or experience (opposed to hereditarian
Origin: 1915–20; environmental Related forms
an·ti·en·vi·ron·men·tal·ist, noun, adjective