Life is a delicate balance between order and disorder. Once small disturbance... One minor infraction of nature's law is all it takes.
This movie is based on a short story by Ray Bradbury.
Chicago 2054. We have discovered a way to do time travel. Even though we use it for recreational purposes there may be a deeper impact.
The application of the story may be misleading as we see from trailers somebody steps on a butterfly however this was not really the problem but the effect. You should be aware of the saying "keep your powder dry." In this case a beautiful woman caused negligence which caused a short which caused the butterfly effect. Moral of the story is don't let a beautiful woman distract you or it may be the end of the world.
Just a side note, it looks like they tried to include every disaster movie you've ever seen and big bug movie (okay little bug), volcanoes, monkeys taking over the world, flora gigantices, and many more unspeakable disasters. Oh and don't forget the evil, uncaring, unthinking, unscrupulous, and many more un's of the government. And don't forget Ben Kingsley as the corporate head who has more un's than the government.
Coming back to the actual movie presentation, the graphics are appallingly hokey. They spend a lot of time on a treadmill in front of a blue screen and don't have any qualms about letting you know that they are more interested in the story than the visuals. Maybe we should be too; yet it is very distracting to see how disjointed the people scenes are from the graphic scenes. This has all the feel of a hallmark movie without the romance.
I'm sure that they're just trying to deliver one simple message. "Don't mess with mother nature"