Definition of ecotage in English:
 ecotage
noun ˈiːkətɑːʒˈɛːkətɑːʒēkə-
mass noun- Sabotage carried out for ecological reasons. -  Example sentencesExamples -  With dozens of cases of ‘ecotage’ amounting to tens of millions of dollars in damages, the FBI has publicly denounced the ELF as ‘the nation's most dangerous domestic terror organisation.’
-  When he hears about an act of ecotage - a firebombing or fur protest, for instance - he'll call up the victimized company or local police agency and let them know he has information that might prove useful.
-  As ecotage, this is far more cold and calculating than the Merry Pranksterish ethos of Clausen's dread nemesis, Earth First!
-  The media coined the phrase ‘eco-terrorism,’ but some activists prefer ‘ecotage’ (a variation on sabotage) or ‘direct action.’
 
-  Synonyms - wrecking, deliberate damage, vandalism, destruction, obstruction, disruption, crippling, impairment, incapacitation 
Origin
  
1970s: blend of ecological (see ecology) and sabotage.