THE IMPERIAL VALLEY, CALIFORNIA, AUGUST 2009: Farmers use tractors with laser surveying gear towed behind as they map out a new field on a farm in Imperial Valley, California, 12 August 2009. The fields are built with very precise measurements at a slight slope to allow for the efficent distribution of gravity fed water from irrigation canals to the plants. (Photo by Brent Stirton/Reportage by Getty Images.)

THE IMPERIAL VALLEY, CALIFORNIA, AUGUST 2009: Farmers use tractors with laser surveying gear towed behind as they map out a new field on a farm in Imperial Valley, California, 12 August 2009. The fields are built with very precise measurements at a slight slope to allow for the efficent distribution of gravity fed water from irrigation canals to the plants. (Photo by Brent Stirton/Reportage by Getty Images.)

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