France will cease over-the-counter sales of agrochemical giant Monsanto’s weedkiller brand Roundup, following a recent United Nations report that found the active ingredient, glyphosate, was “probably carcinogenic to humans.” It’s the newest development in the growing international movement against Monsanto in general and Roundup in particular. French Ecology Minister Segolene Royal announced on Sunday that she had instructed garden centers to stop putting the …