The US supreme court will hear arguments in a key pesticide regulation case on Monday, setting the stage for a ruling that could weaken the ability of consumers to sue companies for failing to warn of product risks. The case centers on glyphosate – a weed-killing chemical used in the popular Roundup brand and numerous other herbicide products. The chemical has been scientifically linked to cancer in multiple studies, and was classified a probable human carcinogen by an arm of the World Health Organization in 2015. Monsanto, the company that introduced glyphosate to the world in the 1970s and is now a part of the German conglomerate Bayer, has spent the last decade fighting more than 100,000 lawsuits claiming it failed to warn customers of cancer risks.…