Reuters: When crude oil was more than US$145 a barrel and investors were flush with cash, building plants to turn coal into liquid fuel for cars and trucks looked like a winning bet. But, as oil has fallen below US$70 a barrel amid a looming global recession and slowing fuel demand, plans to convert plentiful US coal supplies into liquid fuels look less certain. “Things have tightened up,” said Bob Kelly, chairman of DKRW Energy LLC, which is eyeing a so-called coal-to-liquids, or CTL, …