Everyone can be a hero in his or her very own way. Little things can bring big changes, and every person who fights for his conviction and who has the will to change his habits to save the world is a hero.
In the case of climate, one single hero doesn't have a huge effect, that's why we need many of these "little heros" to make a big change. In our times we have two kinds of heros, the ones who plead their whole lifes to show others, what to do to save our world and the others who at least try to live a environmentally friendly life.
myclimate.org