The definition of ECO-TERRORIST I was thinking of is one who attempts to panic people by proclaiming the end of the world as we know it due to ecological disasters, in this case a disaster supposedly caused by mankind.

For as long as mankind has had language there have been those doom criers who predict the end of civilization, or the end of life as we know it, or the end of the world. Civilization, life and the world are still here. But they have changed, and ultimately that is what those "prophets" feared: change. The world is going to change, whether we like it or not. To survive, an individual, a nation, must adapt. Trying to hold it back will only lead to extinction, for the individual, the nation and the human race.
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Something I just thought of, though. It would be interesting to find out whether any individuals or corporations are trying to acquire large tracts of land in areas of the world which are currently not usable as farm land. As the world grows warmer the best farm land will move north and south, farther from the equator.