First, it was cow gas that was wrecking the environment. Then gas-powered lawnmowers. Now, it’s fireworks we’re supposed to worry about. Fireworks, it was reported this week, are helping ruin both the Earth and our health. Where most of us looked up at the sky last night and saw red, white and blue, some people, it seems, saw only the first. Fireworks, some scientists are warning, are toxic, and you know what’s next. All those “ooohhhhhhhs” and “aaahhhhhhhhhhs” will soon be “booooos” and “baaaaaaaaahs.” Except that people, many people, have had enough of “Enough.”“No matter what you do, something is...