Person concerned about the impact of people on environmental quality who believes that some human actions are degrading parts of the earth's life-support systems for humans and many other forms of life. Compare conservation biologist, conservationist, ecologist, environmental scientist, preservationist, restorationist.

someone who works to protect the environment from destruction or pollution

a person who cares very much what happens to nature

a person who is concerned about environmental problems and knows a lot about the environment

a person who seeks to protect "nature" or "the natural environment" from "human stuff" like pollution, wasteful use of resources and excessive human encroachments