1) Carson 2) Ecologist 3) Environmentalist 
[Noun] A person who works to protect wildlife.
someone who advocates the protection of a natural resource, usually by planned management, to prevent its depletion or destruction
supporter or advocate of environmental conservation. As we become more and more aware of how important a healthy environment is for our wellbeing, environmental conservation becomes increasingly more fashionable. The reason that industrialists and businessmen are often found opposing environmental conservation is that they fear an 'unfair' increase...
a person who advocates on behalf of natural resources; Conservation
a person who advocates or promotes conservation, esp. of natural resources.