Something is missing from history books, posits geologist Iain Stewart in this five-hour series: the influence of geologic forces on human events. He travels to all seven continents and undersea, organizing his quest around the four classical elements. Water has shaped great civilizations that strived to control it. Earth, in the form of quakes and volcanoes, has threatened those same civilizations. Wind shaped trade routes, while fire fueled technological innovation. Sunday, June 20, at 8 p.m., and Monday–Tuesday, June 21–22, at 9 p.m., National Geographic Channel
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