From https://www.eenews.net/stories/1062576963 https://www.eenews.net/stories/1062576963: > Rising above the flat landscape of west-central Florida are towerin

From https://www.eenews.net/stories/1062576963 https://www.eenews.net/stories/1062576963: > Rising above the flat landscape of west-central Florida are towering ponds of acidic wastewater sitting atop mounds of a mildly radioactive material called phosphogypsum. And https://en.wikipedia.org/wiki/Phosphogypsum https://en.wikipedia.org/wiki/Phosphogypsum: > Phosphogypsum … [is] formed as a by-product of the production of fertilizer from phosphate rock … phosphogypsum is usually not used, but is stored indefinitely because of its weak radioactivity.