Off-Earth Evolution: Earth Deliverance:

Book Three in the Off-Earth Evolution trilogy.
Konsorcio was just the opening salvo in a greater war. Saga and Altaj lead Terons and Pacis in a fight against the Prots, in an attempt to save the Earth. Their embattled forces become separated and are forced to learn how to survive with their new Earthian allies. Battles rage around the planet, from the jungles of Africa to the ice-covered polar regions, as clashes in the Prots' subterranean layers prove costly. Once again, scientific ingenui...