Solar storms can do lots of damage if they're strong enough. Knock out satellites, interfere with electronic devices here on earth, mostly i'm thinking the magnetic interference would be the most profound, but shouldn't disrupt our physiology. Animals that migrate, however, should have problems with navigation during these storms.

2012 has been hijacked, plain and simple. I've done the "Long Count" research backwards and forwards, and December 21, 2012 simply marks the end of an approximate 5,125 year cycle of the Mayan Calendar. Everyone has misunderstood this to mean it is THE END in the most dire sense of the word. Fortunately for us, December 22, 2012 will simply mark the beginning of the next Mayan calendar cycle.