And They Found Dragons (Book 1) The Boy Who Fell from the Stars

"Jack is a young boy (12) born among 169 survivors of a global apocalypse who now orbit the earth and await its restoration so they can return to the surface. With supplies dangerously low, the time for waiting is over. Humanity's last survivors must return now or die among the stars. There is a problem, though. A big one. Dragons now rule the planet and mankind's only hope rests with a small team of highly trained teenagers who are immune to the dragons' toxic breath, which has poisoned Earth. Only they can lead humanity. But first, they must get to the surface ... alive." -- from teddekker.com.