The Lost Survivors Trilogy by Susan Pfeffer

I remember reading Life As We Knew It (Book One) three years ago on a bitter cold January weekend. I was surprised how rapidly I was drawn into the life of a typical teen named Miranda and her self-absorbed life in a small Pennsylvania town. Miranda's priorities undergo a radical change, however, when an asteriod hits the moon, throwing it out of its orbit and too close to the Earth. There is wild spread devastion such as violent earthquakes, massive tsunamis, millions of deaths due to crop failures and non delivery of goods.

Lucky for Miranda and her family, her mom is extremely resourceful. They are able to heat their home and make do while others are frantic for their survival.

What really stuck with me from this novel was the incredibly dire weather conditions caused by this event--the extreme bitter cold.

The Dead and The Gone (Book Two)was written by Pfeffer to try to answer the question of what it would have been like to have experienced the same devastation from Life As We Knew It, but to have the main character living in a completely different setting--Manhattan.
Seventeen-year-old Alex Morales, his 14-year-old sister Briana, and his 12-year-old sister Julie are home alone in their apartment when the crisis hits. Their mother is working at a hospital in Queens and their father is out of the country on a trip.
The responsibility for survival falls squarely on Alex's shoulders. How will they secure food? How can he protect his sisters from the bands of people who roam the streets looking for food or money. Who will remove the bodies of the dead lining the streets? Will they ever see either of their parents again?

I was surprised to see This World We Live In (Book Three). Told from the perspective of Miranda, the teen protagonists from Books One and Two are brought together when Miranda Evan's father and stepmother arrive with their new baby and a trio of strangers, including Alex Morales! 
Survival is still paramount on everyone's mind despite it being a year now that the asteriod hit the moon causing the devastation that they have all come to see as "this world we live in now."
The ending of Book Three has left wondering if Pfeffer will produce another book in this series.