Salad might be one way to reduce our dependence on oil.

Every year 2 billion tires are sold. Each tire is made from 7 gallons of oil. The oil, which comes from fossil fuels, is converted to make the synthetic rubber. Many are worried about this way of doing business because it isn’t sustainable.   What is needed is another source of rubber for tires.

Enter Lettuce.

Scientists at the University of Calgary in Canada found another source of rubber and that is lettuce. Lettuce makes natural rubber. Dr. Dae-Kyun Ro found that lettuce makes rubber and can be cultivated in cold climates like the US and Canada.

Tires used to be made from natural rubber, which came from the Brazilian rubber tree. Even Thomas Edison in the 1930 sought other plants to make natural rubber and found that the Canadian weed called the goldenrod was a good candidate. Edison, with Henry Ford and Harvey Firestone, tried to produce high quality natural rubber from it. But, that work was abandoned once chemists found how to make synthetic rubber from oil. Now, modern scientists are picking up where Edison left off.

Lettuce produces a flowering stem. Inside this stem is a milky substance that contains key ingredients to make natural rubber.

“We found it [lettuce] produces very high quality natural rubber but of a very low quantity,” Ro said. He continued, “the quality is almost the same as that from the Brazilian rubber tree.” This group is also exploring other plants to make natural rubber.

The work is still in the early stages, so it will be some time — five to ten years — before you see a tire with the words “Made from Lettuce, “ on the side. However, what needs no dressing is how impactful lettuce will be.


Next Generation Science Standards: NGSS LS2.A

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