Doomsday Dawns: (How many doomsdays could there possibly be?)

Doomsday Dawns contains science fiction short stories and poems bringing to life forty radically different scenarios of Mankind at risk from total annihilation. Author Allan Edward Tierney brings to life his conceptions of alien invasion and other fantastic, dramatic, comic and horrific scenarios in the most atmospheric, compelling and imagination-inspiring way. What do you think? How many doomsdays could there possibly be?