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"Those are cars. In most worlds, they came about around a century before the current time period. They're potentially much faster than a horse, and magic is not commonly available to the masses in most worlds. A car also doesn't take up the space needed to raise horses. The haze in the sky is from them... from factories that mass produce goods... lots of sources. For the most part, though, I think there's a lot of technology we'll have to get you used to. In any case, most of these people never lived in a time without the haze in the sky and pollution. There's efforts being made on a lot of worlds to cut back on it, but it will never be like before the industrial revolution again."