The only reason I looked was that I was interested in how special effects, design, layouts, in general, the visual part were made. Considering it's 1972.
Pretty boring drama with some surreal script. Well, with the motivation of the main character, everything is approximately clear, except for the decision at the end (but there, apparently, there is nothing left of the cuckoo). But why did the Earth (command) need to destroy these “green” domes, and what is happening to vegetation there on Earth, I never understood. But this is like the starting point of the whole action (if all this traction can be called action). In general, how incomprehensible started, so incomprehensible and stalled.
Moreover, the whole film is trying to tell us on serious grounds that this is not just fiction, but a kind of high-flown parable! But you actually feel like you're in some kind of madness and ecology lesson for kids.