EVAC: Zombie Apocalypse — D.G. Leigh

What would you do if every tree on the planet grew over a kilometre tall overnight?Wait for the authorities to sort it out?How about if the crown branches formed an interlocking canopy blocking out 95% of sunlight, plunging the Earth into permanent darkness?Purchase a chainsaw?Did I mention the ravenous zombie hordes? - Still buy a chainsaw, right?I dare you to accompany seven year old Susan on her terrifying exodus for survival.