With so many real and pressing environmental crises threatening to harm Planet Earth, why are so many well-meaning environmentalists so easily diverted into foolhardy projects like the campaign to ban plastic water bottles? On January 1, the Town of Concord, Massachusetts, prohibited the sale of "non-sparkling, unflavored drinking water in single-serving polyethylene terephthalate (PET) bottles of 1 liter (34 ounces) or less." To be clear, it's still OK to sell small, plastic bottles of Coke, Red Bull, colored sugar-water, and carbonated water, and it's OK to sell Just Plain Water in 40-oz plastic bottles or gallon jugs. In an approving report on the ban, the Globe and Mail...