Agence France-Presse: China pledged to take a greater role in global issues Thursday as it vowed to work with the European Union on nuclear non-proliferation, energy security and climate change. In wide-ranging talks between Chinese Premier Wen Jiabao and European Commission President Jose Manuel Barroso, the two sides also agreed to to fight protectionism and tear down trade barriers. “China will undertake greater international responsibilities,” Wen said in a joint media appearance with Barroso …