The critical issue in this presentation is whether the reversal is going to happen soon. It is undeniable that the general pole shift and field weakening have presented symptomatically of a reversal or significant excursion, and the only point both ESA/SWARM and MIT use to quell fear is that they believe it will take 1000s of years. The math of losing 5% per decade, and the potential for fast reversals, cast a shadow on such aspersions of safety.