What is an eco-terrorist as noted in the memoir, A Year in the Maine Woods?

An eco-terrorist is someone who tries to disrupt human exploitation of the environment. The community in Maine where the author lives in the site of a lot of logging operations. There are some who seek to try to destroy the logging equipment so that the trees can be saved. For a little while, the author believes that the logging company may think he is an eco-terrorist because he had tree spikes in his truck.