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California irrigation faces its own problems: https://psmag.com/environment/cleaning-up-californias-three-decades-old-water-problem https://psmag.com/environmen

• ttyprintk 7y ago
  Both selenium and arsenic are considered trace elements. Selenium much more so; most of the world's diet is selenium-poor. But selenium supplements are useful in counteractive arsenic poisoning: https://www.ncbi.nlm.nih.gov/pubmed/23800687 https://www.ncbi.nlm.nih.gov/pubmed/23800687