The entrenched monopolies that run large, dirty power plants are facing new competition from rivals with smaller and cleaner technologies at their command.
The reusable pads could require machine washing after a single large dirty window, but more typically the company said they needed a wash every few months.
But even at its worst, it has managed to match the output of only two dozen or so large dirty power plants.
A tall, bearded man in a food-stained white undershirt with a large, dirty stuffed animal slung over one shoulder wanders around the room passionately orating, but no one is listening.
Andy Goldsworthy's snow-melts, in which large, dirty snowballs are allowed to dissolve on sheets of absorbent paper, leaving behind only the marks of their own liquefaction, strike me as among the most graceful of those lost-and-found-in-translation efforts.
I remember thinking, "Who is that large dirty man in those disgusting clothes, and then I said to him, 'I've never kissed a fish".
Make sure there's no large dirty spots on them, and they're fine to eat.
Those songs deified the largest, heaviest, dirtiest, least fuel-efficient engines in American history.
Sex and booze featured highly, from "Watkins Ale" to "Hot Tamales", with the three ukuleles, two lutes, plucked double bass, theorbo and baroque guitar sounding like the world's largest – and dirtiest – double harp.
Even emissions in China, the world's largest and dirtiest energy consumer, may peak by 2030, thanks to huge investments in new clean-coal power generation, nuclear and renewable energy and long-distance transmission lines.
