Survival of the Fittest (Book #1) (The 100)

~ Intelligence is based on how efficient a species became at doing the things they need to survive. ~

97 years had passed after a nuclear war destroyed the whole world. Some people escaped the war, they went to space and were now living in what was called 'the Ark'.
The world would be habitable after another hundred years or so but because of lack of oxygen, the habitants of the Ark only have a couple months of oxygen left.

The Council decide to send 100 prisoners back to Earth, to see if it is livable again.
Taylor Kane is one of them. She spent six months in a prison called the Sky Box. With another year left for her to live before she would turn 18 and would be floated, her father succeeded to get her into the drop ship along with 99 others.

Can they actually make it to the ground? And would Earth indeed be livable again?