On the latter risk, Anissimov writes:
If an EMP attack came, cars and trucks would just stop. Factories, controlled by computers, would stop. Molten steel on the assembly line would cool and solidify in place due to failure of the heating elements. The vast majority of tractors, combines, and other heavy machinery would become useless. Transformers and other electrical elements, large and small, would be fried. The largest transformers have to be ordered from China and are generally ordered with a year of lead time.By the way, if you're particularly paranoid about this, you can always convert your house into a Faraday Cage. I'm just not sure how useful all your electronics will be given that everyone else's will be fried.
An effective EMP attack on the US would cause tens of trillions of dollars of damage. Cities would run out of food in a few days. The US grain stockpile only has about a million bushels of wheat. Wheat is the only common grain with enough nutrients to sustain someone on an all-grain diet. A bushel is only 60 pounds, and someone needs about a pound of wheat a day to avoid hunger pangs. Ideally two pounds if you are doing manual labor. 60 million man-days of food is not a lot. The population of the United States is 300 million. That means our grain stockpiles are enough food for everyone to eat a fifth of a pound and then they’re gone.
And in regards to the botulinum risk, he writes, "99.9% of the population will dismiss [it] as not a big deal, due to wishful thinking. It’s all just words on the page, until people start dying."