Fortunately, a sudden drop in worldwide temperatures eliminated the zombie virus and humanity could thrive once again, this time in parkas.
"I've got dreams like you--no really!--just much less, touchy-feeley. They mainly happen somewhere warm and sunny on an island that I own, tanned and rested and alone surrounded by enormous piles of money." -Flynn Rider, Tangled
unfortunately fire is the result of excited particles, for one to be truly fire proof would destroy their ability to move, and they would still be meltable, so humanity turns into statues.
Self quoting is the key to sounding wise and all knowing.
Remember: the plot is nothing more than footprints left in the snow after your characters have run by on their way to incredible destinations. — Ray Bradbury