That is true. Incidentally, seeing as how the Irish & Slavs, and Catholics gained their full equality when by dad was young, the only things I have ever really had cause for are moral issues such as abortion, of which I have chosen to sit on my rear and damn liberals to hell rather than go out be an activist...
Basically, conservationists will do works projects, like maintaining forests, buying up land for public parks and reserves, restoration projects, etc. Environmentalists will tend to target businesses for massive regulation, advocate for carbon credits, and all of the things that we see them do today, but the movement does indeed spring from conservationism, and particularly the movement that came out of the 1890 Census, which declared the Frontier closed, making everyone realize that the resources of the continent have limits. Interestingly it is animal rights that would kind of be a bridge between the two camps, and yet it is the area with the most notorious extremists, such as PETA.