While we continue to hold this amazing (and in my opinion, almost frantic) level of optimism as expressed in markets, as well as in the rising of President Obama's popularity from the ashes, the nature of the coming decline has me very, very worried. I especially worry about the next war, frankly.
As part of that, if you want to indulge in some worst-case planning, click over to Alex Wellerstein's NukeMap. This is a tool that lets you use Google Maps to drop a variety of nuclear warheads, from an improvised terrorist nuke to the largest bombs ever tested or deployed, anywhere on the map and see the expected results. Note that the blast pattern shown will not include effects of terrain and is an optimized air burst (in other words, the blast you will see is a worst-case type of scenario).
This is not really meant to be disaster porn, but if you are concerned that nuclear war could accompany the coming era a deep negative mass sentiment, then this tool may help you at least see what a nuclear strike could do to places of interest to you and yours.