In the back of Indigo's Boston headquarters-past the gleaming new desks, past empty rooms awaiting new employees after a $100 million fundraising round-is a giant elevator. The elevator has one main purpose: to haul dirt up by the pallet load.  Indigo is an agriculture company. But it doesn't sell seeds or fertilizer or pesticides or any of the typical products agriculture companies have made billions selling in the past century.

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