By Laurie Chen BEIJING, Dec 10 (Reuters) - European firms are accelerating efforts to diversify away from Chinese supply chains as Beijing's self-reliance drive and export controls deepen global trade uncertainty, the European Union Chamber ​of Commerce in China said on Wednesday. China's trade surplus topped $1 trillion for the first time in November, ‌as exports to Europe, Australia and Southeast Asia surged in the wake of U.S. tariffs, fuelling diplomatic tensions over unsustainable trade imbalances. ...