Agence France-Presse: The United States does not maintain controls on clean energy exports, a senior American trade envoy said Tuesday, while addressing Chinese concerns over billions of dollars in potential trade. “No clean energy exports are affected by export controls,” US Commerce Assistant Secretary David Bohigian told reporters in Beijing at the start of a clean energy and environment trade mission to Asia. He said Chinese officials told him earlier this year that 10 billion dollars’ worth of …