HONG KONG — The busy rush hour in Shenzhen, a new city of some 20 million people in Guangdong Province, is almost silent. Commuters whisper past on electric bikes and scooters or board one of Shenzhen’s fleet of electric buses and taxis, all part of the city’s pool of 90,000 new energy-efficient vehicles. It’s part of what Chinese city officials call “ecological civilization.”
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