Reuters: China’s largest plastic bag maker has closed following a state-led environmental campaign discouraging plastics use, Xinhua news agency said on Tuesday. China launched a surprise crackdown on plastic bags in January, banning production of ultra-thin bags and forbidding its supermarkets and shops from handing out free carrier bags from June 1. Suiping Huaqiang Plastic Co, owned by Guangzhou-based Nanqiang Plastic Industrial Ltd. and employing 20,000 workers stopped production …