"The Annual Migration of Clouds" by Premee Mohamed

SYNOPSIS: 

In post-climate disaster Alberta, a woman infected with a mysterious parasite must choose whether to pursue a rare opportunity far from home or stay and help rebuild her community.

The world is nothing like it once was: climate disasters have wracked the continent, causing food shortages, ending industry, and leaving little behind. Then came Cad, mysterious mind-altering fungi that invade the bodies of the now scattered citizenry. Reid, a young woman who carries this parasite, has been given a chance to get away - to move to one of the last remnants of pre-disaster society - but she can't bring herself to abandon her mother and the community that relies on her.