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I think the movie was trying to tell us something about not wasting energy and conserving a bit more, that's fine. But to do it in this setting, I sorry but it's been done a million times. If you want to make a fictional sorry that conveys a message, use something "in your face" fictional (go see district 9), don't use pseudo-science. I could go on a big rant about what was wrong with the science of the movie, but I don't think this site is the correct forum for that.

In the end, if they would have used some out-of-this-world reason to explain what happens, the movie would have been better. Should you see it, sure, just don't read too much into it. The movie isn't deep and it's not a prophecy of what is to come, although I'm sure there are people out there that will say it is.