Associated Press: Manufacturers on Thursday went on the offensive against mandatory reductions in U.S. greenhouse gas emissions, unveiling a study projecting $631 billion in costs by 2020 if Congress institutes a reduction program. A study commissioned by the National Association of Manufacturers and the American Council for Capital Formation estimated that the economy would have 1.2 million to 1.4 million fewer jobs by 2020 than would otherwise be the case as the effects on coal and other industries …