Tolkien was undeniably opposed to industrialization, and particularly one of its consequences: modern warfare. I guess part of that came from being born in the late-19th century and seeing the acceleration of environment destruction and rampant materialism take hold, and of course his service in World War I.
I believe this is why in his writing, the "good" cultures fight in the old romantic ways, with swords and bows, while the "evil" cultures use war towers, explosives, and build elaborate machinery. Likewise, the "good" cultures are in harmony with the environment, while the "evil" cultures only care about producing armies and weapons, if it doesn't serve that purpose they destroy it.
Eco-fascist is probably too strong a word, but certainly there are some parallels. For me, one of the deepest, most resonating passages from all his writing is the following (from LOTR):
They had come to the desolation that lay before Mordor: the lasting monument to the dark labour of its slaves that should endure when all their purposes were made void; a land defiled, diseased beyond all healing -- unless the Great Sea should enter in and wash it with oblivion. "I feel sick," said Sam. Frodo did not speak.
Everytime I read this, I can not help but think of the places I have seen that meet this description. I felt sick. And now the Great Seas are in fact rising to wash us with oblivion...
Yeah, you can't tell me he wrote this in a vacuum.