Feeding Time

Imagine planet Earth ravaged by a Great War, parched from lack of water, plagued by an extreme and erratic climate... and yes, of course, populated by gruesome creatures from outer space, constantly thirsting for fresh blood. Is it possible to live normally in such a world? Is it possible to ever survive in such a world? Can one do something else besides exist day to day, waiting to die?
Of course not. There is no light at the end of the tunnel.
But one of us has a different opinion...