Earth

Earth is a planet that got ruined by Tiberium. The planet was mistreated due to wars made by Nod. Nod tries to get Ascension to escape earth. The world was horribly divided to 3 zones.

http://images.wikia.com/cnc/images/thumb/6/61/SanFrancisco.png/120px-SanFrancisco.png[Red Zone]