CHICAGO--(BUSINESS WIRE)--The arrival of warmer temperatures are always welcomed, but sometimes they also bring about an increase in unwelcomed solicitations by scam artists. ComEd, Nicor Gas, Peoples Gas and North Shore Gas are joining forces to warn Illinois customers to be on alert for scam artists posing as utility representatives. The Better Business Bureau states that the number of reported scams generally rises with warmer weather. Nationally, there has been an uptick in people claiming