Agence France-Presse: China pressed Wednesday for the US Congress to pass legislation to fight global warming, warning that inaction could hold up a new treaty slated for Copenhagen in December. China’s chief climate negotiator Xie Zhenhua held talks in Washington with the administration of President Barack Obama, who has vowed action to slow the planet’s warming in a sharp reversal from his predecessor George W. Bush. A UN-led conference in the Danish capital in December is meant to approve a new …