Reflecting growing social tensions over China's high pollution, hundreds of demonstrators marched…to protest the building of a lithium-ion battery plant, while officials…said they might pull the project. The Shanghai protest was the third in recent weeks since residents learned that Hefei Guoxuan High-Tech Power Energy Co. would construct a battery factory in the Songjiang district…Last month, a caravan of cars bearing green ribbons drove around the community to call attention to concerns that the plant would pollute the air and local water sources… Reuters…estimated that the demonstration attracted 1,000 people…The protests, plus petition signatures…already have pushed Songjiang officials to scale back the factory's production capacity, according to local media… [Chinese article includes comments by company] [also refers to CNPC]