What do you often call a person who is actively involved in protecting the environment?

The term eco-warrior is a self-description for an environmental activist that adopts a 'hands-on' effort to save a plot of land. In the UK it coined the term in the 1990s, a label that many people actively taking ecological direct action resisted, for philosophical reasons.

A common symbol of an eco-warrior is the Eco Warriors Flag. The Eco Warriors Flag has four colours. Red / yellow / black are colours from the Australian Aboriginal flag. Representing indigenous cultures worldwide and the beginnings of all humanity.

Another use of the term refers to an environmental activist who engages in illegal activities, also known as eco-terrorism. However, an eco-warrior is also someone who utilizes the courts to halt, suspend, or otherwise derail a human activity that the activist believes adversely impacts the environment.