WORRIED THAT URBAN congestion and fears about climate change could provoke a backlash against petroleum-fueled cars, big auto makers are revving up efforts to electrify automobiles.

• 由于担心城市拥堵和对气候问题的关注可能引发人们对燃油汽车的抵制，汽车巨头们在电动汽车上加大了努力。