That's sort of a handwavy dismissal ins't it? What exactly is the pollution Roundup causes and is it worse than, say, petroleum based mulch, potassium chloride, and copper sulfate?

Yeah. I don't have any real numbers on pollution metrics either way, but it is a fact that so-called organic farming requires more land than traditional ag to produce the same output, and thus more tractor fuel burned per food, a direct source of pollution. As far as I know, (atmospheric) pollution isn't a slam dunk argument against roundup.

There are quite a few studies claiming that glyphosate is toxic. I bet this will turn out like cigarettes. Companies will fight to death until the evidence is absolutely overwhelming.