Susannah Tringe grabs a pair of green rubber boots from the back of her truck, pulls them on and wades into a pea-colored pond until she's standing calf-deep. We're just a few miles from Google's main campus in Mountain View, Calif, but from where we're standing, Silicon Valley's urban sprawl is just a faint, hazy blur. Stilt-legged birds skitter along the banks of the pond; cord grass and still water stretch to the horizon.
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