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By the mid-1930s, unsustainable harvesting methods used to increase yields killed almost a quarter of Mexico's sapodilla trees, and scientists predicted total forest depletion within four decades.
Chewing gum manufacturers turned to cheaper synthetic bases made from petroleum, wax and other substances.
MORE IDEAS FROM THE SAME ARTICLE
Modern-day chewing gum was invented by Thomas Adams Sr., who got a supply of chicle. They first tried to vulcanize the chicle into some useful industrial substance but found a better idea of boiling and hand-rolling it into pieces of chewing gum.
Chewing gum has been around for hundreds of years in the form of chicle, a resin obtained from the sapodilla tree in southern Mexico and Central America.
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