https://creativecommons.org/publicdomain/zero/1.0/https://www.rawpixel.com/image/8802851
Englemann prickley pear cactus growing outside a solar heated greenhouse at the University of Arizona Environmental Research Laboratory at Tucson where experiments in high intensity agriculture and aquaculture are being conducted.
Studies have resulted in greatly increased yields, 04/1974. Photographer: Norton, Boyd. Original public domain image from Flickr
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