LA Times: Academy Award winners Joel and Ethan Coen, known for their grimly comic portrayals of human nature, are poking fun at a new target: the coal industry. The filmmaking brothers have directed a television spot for an environmental coalition that’s trying to demolish the notion that there’s anything clean about so-called clean coal. The commercial, which began airing Thursday on cable-TV channels, plays like an air-freshener ad. A grinning lacquer-haired pitchman extols the virtues …