News reports suggest that arson against a mansion development in Washington state may have been the work of "ecoterrorists". The evidence released so far is skimpy, and even the term "ecoterrorism" is debatable to me, tying it to terroristic violence when "ecoarson" might be more appropriate.
Regardless, though, I'm very glad we don't have foolish people pulling these stunts in our area. They are so counterproductive that they would only make the job of sprawl-fighting organizations like CGF much tougher.
Civil disobedience, by contrast, is more of a mixed outcome. I could see it being counterproductive in many circumstances, but not always, and doesn't involve destroying property or even a slight risk to human life. Of course, civil disobedience is not a technique that CGF has used.