How has Earth Day evolved?

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How are drones changing agriculture?

How are drones changing agriculture?

Drones give farmers a fresh look at what's happening with their crops. Find out how drones are changing agriculture at HowStuffWorks.

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  • Binder, Libuse. "The Earth Day Evolution." Earth911. March 15, 2008.
  • Lewis, Jack. "The Spirit of the First Earth Day." EPA. January/February 1990.
  • Van Fleet, Toby. "The Evolution of Earth Day." Portland Tribune. April 15, 2008.