Advent of Destruction

In the year 2047, a wave of cosmic radiation shakes the earth.
Communications failed, satellites crashed to earth, power plants exploded, and all communication devices that used electricity stopped working.
This shook the earth's economy deeply, causing civilization to fall within days.
If that wasn't enough after a few years the animals became fierce and strong beasts through an extremely fast evolution process, making the remnants of civilized communities to be destroyed by waves of beasts.
This raised the hypothesis that humans suffer the same fate as animals....