1) Carson 2) Conservationist 3) Ecologist 4) Green 
An environmentalist broadly supports the goals of the environmental movement, `a political and ethical movement that seeks to improve and protect the quality of the natural environment through changes to environmentally harmful human activities`. An environmentalist is engaged in or believes in the philosophy of environmentalism. Environmentalis.....
An individual who is concerned about the protection, conservation and improvement of the natural environment
environmentalist approaches to health seek the causes of ill-health in the environment of the patient rather than in his or her biological constitution.
[n] - someone who works to protect the environment from destruction or pollution
conservationist noun someone who works to protect the environment from destruction or pollution
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, esp. in moral and intellectual attributes, are predominantly determined by environmental ...