Business Green: Businesses seem to have called time on the US’s only national carbon trading market, blaming an absence of legislation as emissions-trading laws remain mired in Congress. The Chicago Climate Exchange (CCX) operates a cap-and-trade scheme which, since its launch in 2003, has attracted major players such as Ford, Bank of America, IBM and Intel. Members made a voluntary but legally binding commitment to meet greenhouse gas emission reduction targets either by cutting emissions or by buying emissions…