It is first known to have appeared in 2002 in the wake of the February 12 congressional hearings titled "The Threat of Eco-Terrorism" which discussed groups including the Earth Liberation Front (ELF) and the Animal Liberation Front (ALF).
人们知道，这最早见于2002年，正是紧接着2月12日名为“生态恐怖主义的威胁”的国会听证会而至的，会上讨论了地球解放阵线（ELF）和动物解放阵线（ALF）等团体。