Looks interesting, though it could be lefty anti-Monsanto panic - stuff I try to avoid posting here. I do not know if glyphosate is all that dangerous, nor what levels would be OK to consume. Wikipedia has a clear article on glyphosate, which points to an article that states impacts on humans is not known. The Wiki entry has a short lawsuit section covering Monsanto’s key ingredient herbicide, but again these are related to regulation rather than impacts. 

A recent study conducted by a German university found very high concentrations of Glyphosate, a carcinogenic chemical found in herbicides like Monsanto’s Roundup, in all urine samples tested. The amount of glyphosate found in the urine was staggering, with each sample containing concentrations at 5 to 20-fold the limit established for drinking water. This is just one more piece of evidence that herbicides are, at the very least, being sprayed out of control.