Extremist groups are never the solution for progress. It doesn't matter if their intent is to kill people for their beliefs or destroy structures in protest of what they do to the earth, in both cases all it does is discredit people that take a similar stance towards the issue. We can save the planet by collectively owning the fact that we're harming it, without any forms of terrorism.
Ecoterrorism can undermine the achievements of legitimate ecological movements worldwide. This notion that they can achieve their ideals by using violence, can only further separate public opinion and damage the reputation of those who prefer the pacific approach. Ecoterrorism should receive wide condemnation and can not be the answer to world ecological problems.
The industrialization of society has had tragic and long-lasting consequences on the future of the human race as well as the well-being of its present, but that does not make ecoterrorism a necessary tool. The planet will inevitably end, and technology is advancing to the state that this planet will be able to be abandoned when necessary to do so.
Eco-terrorism usually refers to acts of violence committed in support of ecological or environmental causes, against persons or their property (Wikipedia). I do not believe eco-terrorism is a necessary tool in the battle to save the planet from imminent destruction by the human race. I believe people who find actions that could be defined as eco-terrorism are just as much of a problem as those that harm the environment.
No, ecoterrorism is not a necessary tool in a battle to save the planet from imminent destruction by the human race, because there is not sufficient evidence that humans are doing anything that is going to result in the planet being destroyed. Humans only even populate a very small portion of the earth. There is no evidence that anything we are doing is having a lasting impact.