Reuters: China is mulling emergency plans to keep Olympic skies clear and may push more cars off the road in Beijing and nearby cities if wind or rain do not disperse smog build-ups, government pollution advisors said on Wednesday. Scientists blamed a sultry haze that shrouded the host city over the weekend on an unusually long bout of hot, humid weather and say the combination is unlikely to be repeated during the Games, which start August 8. But they are readying back-up plans for …