"Now is not the time"
Only about 30% of the earth's surface, was considered a Red Zone, meaning it was uninhabitable by human life, due to Tiberium infestation. Such notable locations include Italy, and the Australian Outback.
About 50% is Yellow zones. War-torn regions, in environmental distress, containing a majority of the world's population. It has moderate amounts of Tiberium, but no so much that it is uninhabitable.
The last 20% are blue zones. Wealthy, almost pristine areas, with minimal Tiberium