Usually plastic’s basic building block is petroleum-based cellulose. But hemp is perhaps the greatest cellulose producer on the planet. Hemp hurds – the inner core of the hemp stock – are comprised of as much as 85 percent cellulose. One of the world’s oldest crops, hemp was harvested by the Chinese 8,500 years ago. Hemp remnants have been found dating back 6 millennia (6,000 yrs.). The first hemp planted in the U.S. was in Jamestown, Virginia, where growing it was mandatory.