You've hit a lot of very worrisome events. I have 2 to add....

1. Peak Oil - the theory by Hubbert that oil production will or has peaked and that global demand has out paced supply. Since food, medicine, transportation, refrigeration, etc., all rely upon oil, some believe this will lead to resource wars (Iraq), thinning of the heard due to war, starvation, disease, and the downfall of man as we know it; and

2. Republicans in any position of power.

(Sorry about No. 2...but it is terrifying)