Glyphosate is toxic to aquatic lifeforms and insects. The rapid decline in insect life and increasing damage to aquatic biomes is threatening human life even if the substance itself is not toxic to humans.

Furthermore the studies for humans are looking at typical exposure rates with higher exposure having adverse health effects. Finally the problem with toxicity is also that a substance by itself might not be toxic enough to be causing health effects at common exposure levels. However we are exposed to thousands of such substances which in sum do become toxic, even if every single one is way below their threshold.