"(beginning narration) It began, as always, with the desire for power. The need to conquer, the hunger to consume. Inevitably, this led to conflict. Humanity fought at endless battle against itself... Until it was forced to unite against a power far greater than it had even known. But even united, humanity left only destruction in its wake. Despite their best efforts to survival, the humans of Sera continute to march blindly to their imminent doom... unaware that their misguided attempts at retaliation were only leading them ever closer to extinction. (Flashbacks from Gears of War 1). They had thought us crippled by their weapons of mass destruction. But to survive is to endure and prosper. And we have most certainly survived. Jasinto now stands as the last bastion of humanity, a final, desperate defense in the face of impossible odds. In a way, i pitty them... but humanity, as always, brought this war upon itself. (The end of the cutscene with the Crimson Omen)."
January 1, 1970
https://en.wikiquote.org/wiki/Gears_of_War_2