Command & Conquer 3: Tiberium Wars

More than 50 years have passed since the Earth experienced Nuclear fallout, the biggest part of the planet is not suitable for living, that's why people fight to death for clean zones which are suitable for living.

To protect such zones, a special military organization "GDI" was created, which aimed at cleaning the Earth and bringing peace - you are the one who is in charge of this organization. But there is also a certain tyrant and despot called Kane who doesn't wish to accept the new rules of "GDI", he gathered a powerful grouping of rebels called "NOD brotherhood".