Foreword by Brian Marick

Imagine yourself skimming over a landscape thousands of years ago, looking at the people below. They’re barely scraping out a living in a hostile territory, doing some hunting, some fishing, and a little planting. Off in the distance, you see the glitter of a glacier. Moving closer, you see that it’s melting fast and that it’s barely damming a huge lake. As you watch, the lake breaks through, sweeping down a riverbed, carving it deeper, splashing up against cliffs on the far side of the landscape—some of which collapse.

As you watch, the dazed inhabitants begin to explore the opening. On the other side, there’s a lush landscape, teaming with bigger animals than they’ve ever seen before, some grazing on grass with ...

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