the.com/environmentalism

means The belief and movement devoted to protecting the natural environment through policy, activism, and changed behavior.

from Built from 'environment' — ultimately from the French 'environner,' to surround or encircle — plus the suffix '-ism,' which turns a thing into a doctrine or movement. 'Environment' entered English broadly in the 1800s meaning one's surroundings; the specifically political sense of 'environmentalism,' as an organized concern for protecting nature from industrial and human harm, took hold in the 20th century as ecological science and conservation politics merged into a cause with a name.