There has been a lot of semi- and pseudo-scientific speculation about the consequences of astronomical earth changes. Mostly surrounding the possibility that meteors are the most dramatic astronomical event that has, or will, affect the earth.
However such serious investigations as the Greenland Ice Sheet Project are yielding very interesting results. But more interesting are the well-documented solar cycles that NASA has tried unsuccessfully to predict with greater accuracy.
The sun at at 26,000 light years from the core of the Milky Way is the heavenly body most influential on our planet. And though the coming peak in its activity cycle does not necessarily have to "wreak havoc", it certainly seems like something that world leaders should be aware of, and perhaps even prepared for, if not preparing for.
Political realities will probably not allow for vast expenditures of money to prepare for something unpredictable. But that is precisely why individuals should make themselves more aware. I personally believe the notions of "survivalists" that individuals can hide from the events is a counter-productive solution.
