The United States has urged China to move forward its goal of achieving a peak in carbon dioxide emissions before 2030, but the Asian country has rejected it, sources familiar with bilateral ties said Tuesday.U.S. climate envoy John Kerry made the request during his meeting in April in Shanghai with Xie Zhenhua, special representative on climate affairs for China, the world's largest CO2 emitter, the sources said.The move indicates that the administration of U.S. President Joe Biden and the leadership of Chinese President Xi Jinping have been at odds not only over trade, security and human …READ FULL ARTICLE