The Effort

In a disaster story like this, I am looking for the plot, how the disaster came about, what, if anything could be done to prevent or fix it and so on.
While there is a bunch of this in the book, it was mostly about the characters, what they felt, how they reacted.
I was more interested in the parts about trying to protect the earth than I was in the symptoms of severe sleep deprivation and hunger

The collapse of civilization caused by the panic would result in billions starving to death or being killed by other people.It seems to me that if the comet had hit, it wouldn't have caused more damage to human life than the panic that was caused by its arrival.After the comet is handled, the situation for survivors is described as a second Dark Ages.But it's actually much worse.Most people don't know how to grow or hunt for food, make tools etc.It would be more like a second stone age.
It was an OK book, but I don't think I was the target audience.