AURA

Per Wikipedia as downloaded 3/17/2019:

Guayule is a flowering shrub native to the American southwest and northern Mexico. In times past the latex it produces has served as a backup to rubber, and “In October 2015, the Bridgestone Corporation announced the creation of the first tires made entirely of guayule rubber, having built an experimental farm and biorubber research center in Mesa, Arizona …. The guayule [they use] is grown in Mesa and Eloy, Arizona.^[5][6]

With the AIDS crisis of the 1980s, the surge in rubber glove usage revealed how many people were allergic to latex (about 10% of health care workers, according to OSHA), and thereby created a niche market for guayule … due to its hypoallergenic properties.

Lester R. Brown of the Earth Policy Institute, says "[food based] biofuels pit the 800 million people with cars against the 800 million people with hunger problems,"^[9] meaning that biofuels derived from food crops (like maize) raise world food prices.

I know I’m sounding like an economist or like Coronado when I say such things, but I’m trying to be real about this. So, anyway:

"Guayule can be an economically viable biofuel crop that does not increase the world's hunger problem.^[10]

Guayule has another benefit over food crops as biofuel - it can be grown in areas where food crops fail.”

By the way, the Aztecs were playing ball thanks to guayule before Columbus sailed the ocean blue. Coronado, please take note of this, huh?