For decades now we've learned about a curse that has been plaguing the Earth. Quietly yet quickly changing our planet, forever. Storms are intensifying every year, floods and wildfires becoming more and more frequent and temperatures worldwide are exceeding previous records. This curse is global warming. Humans were the ones that set the curse and are now the ones suffering from it.
In the year 2032 global warming takes a turn for the absolute worst. There is no longer ice found at either of the poles, low lying countries have been completely submerged underwater and most deserts around the world have almost doubled in size. Hurricanes are now your common thunderstorm and mega-hurricanes have ripped apart entire cities. Cataclysmic weather phenomena are destroying everything man has built and that's not even the worst of what has happened.
Frozen deep underneath the arctic laid a virus that has been dormant for centuries. Scientist named it "Ursus-1". Named after polar bears for being the first animals known to spread the virus. This virus directly attacks the brain killing most but leaving some only brain dead. Creating actual zombie like people that only know that they need to eat to survive. Studies found that people with an "o" blood-type are unaffected by the virus. Leaving roughly 37% of people on Earth healthy.
Fast forward to the present. The year is 2046 and humanity is struggling to adapt to the new world. Around the equator has became a band of never ending extreme weather and containment attempts have tried to kill off most of the infected but has proven more difficult than first suspected. In between the north pole and equator sits most of civilization settled in new cities fighting for survival. Welcome to The Wasteland.