Talk Radio News Service: Sen John Kerry (D-Mass.), who chairs the Senate Foreign Relations Committee, called upon the U.S. and China to escalate their efforts to prevent climate change Tuesday. “These conversations [about climate change] between the U.S. and China are at a critical stage… they need to speed up. They need to focus,” Kerry said during a conference call. “The U.S. needs to lead, we [the U.S.] have an obligation to lead”, Kerry added. However, Kerry stressed that this did not release China …