I am all for looking at alternatives but surely they thought about this before using? Glyphosate, or Round Up as I know it for garden use, has been scientifically proved to be safe and with no health issues.
On glyphosate, a recent discussion with a work colleague who indicated recently that he would not use pesticides. On questioning, I found out he used Round Up, purchased from a Garden Centre, and slug pellets. He was unaware Round Up included glyphosate and both were in fact chemical pesticides.