Reuters: The second largest U.S. coal producer, Arch Coal Inc (ACI.N), could support a carbon control program that helps develop technology allowing continued use of coal, Arch Chairman and CEO Steven F. Leer said Thursday. President Obama has proposed, and many analysts expect Congress to pass, a program that caps total U.S. carbon emissions and allows companies to trade allowances as they find ways to comply. “We think ultimately this Congress will pass a cap and trade,” Leer …