A better system, Naha believes, would incorporate sensors to detect the approach of a herd. A warning would go out to village heads and trained local response teams who would monitor the situation and try to intervene before crops are trampled and chaos erupts. Naha doesn’t mean motion sensors or heat sensors, both of which would be triggered by other mammals. He means seismic sensors: sensors triggered by vibrations so powerful only the footfall of an elephant (or a small earthquake) would have created them.
