Seriously?! cats and dogs eat grass and upchuck when they aren't feeling well (worms, hairballs, etc.). That has nothing to do with the grass. The grass causes them to vomit, which in some instances helps the animal. Should we be putting weed killers on out grass? no. Is the government poisoning people through the air? most likely. Are all cats and dogs upchucking because there is poison on the grass? NO
And quite frankly, I can't take anything seriously from someone who believes the Earth is flat and has no real evidence to support it. Good catafrikinday!