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We live at the bottom of an ocean of air -- 5,200 million million tons, to be exact. It sounds like a lot, but Earth's atmosphere is smeared onto its surface in an alarmingly thin layer-- 99 percent contained within 18 miles. Yet, within this fragile margin lies a magnificent realm -- at once gorgeous, terrifying, capricious, and elusive. With his keen eye for identifying and uniting seemingly unrelated events, Christopher Dewdney reveals to us the invisible rivers in the sky that affect how our weather works and the structure of clouds and storms and seasons, the rollercoaster of climate. 18 Miles is a kaleidoscopic and fact-filled journey that uncovers our obsession with the atmosphere and weather -- as both evocative metaphor and physical reality. From the roaring winds of Katrina to the frozen oceans of Snowball Earth, Dewdney entertains as he gives readers a long overdue look at the very air we breathe.