Coldplay is well known for their social activism, especially in fair trade campaigns, and they give 10% of their earnings to charitable causes.
Known for his animal rights activism and as a crusader for many good causes, few suspected Phoenix as a drug user.
Her mother's battle with the illness is sure to be a contributing factor to Applegate's activism in breast cancer awareness.
Lately, there have been some signs that grass-roots activism is reappearing.
Carson, on the other hand, is not against environmental activism per se, but she is far less dedicated to the movement.