the same institutions that would conduct the studies also are funded by Monsanto and other mega corps... who seem to fund studies that support their claims...

And who can say how long it takes for effects to become apparant. We pump so much into the environment already, there may be a synergistic (two or more influences that multiple an effect) action going on.

think of drug studies that pass tests only to be recalled later as unforseen problems arise... or they just don't work out the way we thought they would. a study is only as good as the questions it asks and you can't ask everything at once.