Here are some ideas:
The Rupture
The Invasion
Mankind's Disgrace
The Sterilization
Global Warming
Death of the Moon
The Dry Rains
End of the Living
The Purification
The Revelation
The Ozone Event
Global Warming
Our Expiration Date
The Severance
The Wipe Out
Day of the Dead
Our Mutual Destruction
Terminal Velocity
The Tipping Point
The Decimation of Mankind
