Children of Earth — Dennis Ogden

On war torn Earth mankind is on the edge of destruction.
Savage, never-ending wars have poisoned the air and the land. There seems little hope that any life will survive. In desperation five nations have made frantic efforts to save a few of their people.
The American space ship has found a planet where the children, but only the children, could make a life for themselves â€" if they can get to the ground successfully, and if the natives will allow them to stay and live in peace. But what of the other four space ships?
The chronicles of the survivors' efforts to make a life for themselves on a new planet present a gripping tale of danger and struggle in the face of adversity.
This trilogy is the first in a series about the planet Last Chance