Go North, um I Mean South

Even though I'm not a member, I watched a repeat of Nova yesterday on my local PBS station. It was called Magnetic Storm and dealt with the Earth's magnetic field and how it was gradually weakening. Basically the field is decreasing because either the Earth is about to lose it's field because the core is solidifying or the field is about to reverse itself. The first cause is hypothesized to be why Mars is a dead planet. The second is what most scientists believe is happening now to the Earth. I thought it was very interesting that the Earth has reversed its magnetic field hundreds of times in the past and that we are overdue for it happening again. It's a scary scenario and life would become more complicated than it is now. That would be for the people who don't die as a result of the reversal.