environmentalist

noun environmentalist

• ecologist — the branch of biology dealing with the relations and interactions between organisms and their environment, including other organisms.
• conservationist — A conservationist is someone who cares greatly about the conservation of the environment and who works to protect it.
• preservationist — a person who advocates or promotes preservation, especially of wildlife, natural areas, or historical places.
• green — of the color of growing foliage, between yellow and blue in the spectrum: green leaves.
• naturalist — a person who studies or is an expert in natural history, especially a zoologist or botanist.