Actually, to me those sound terrifying. At this time I am not worrying about EMP. Having looked into it, I haven't been able to find any proof Iran, NK, or other minor powers have the technology to get a nuke that high (+300 miles) above the USA. As much as a terrorist group would like the put us in the dark I feel they'd take the easier route of trucking the nuke into a city then detonating it, and even that I consider to be a low threat. Sidenote: I'll start worrying once a rogue power develops a rocket strong enough to do this.

Economic disasters seem much more likely to me at this time.

-Blast

p.s. I welcome any information or links indicating terrorists currently have the launch capabilities needed.