Global stocks retreat a second day on growth worries, copper slips

By Herbert Lash NEW YORK (Reuters) - Global equity markets fell for a second straight day on Wednesday on mostly weak economic data while metals prices slipped on renewed concerns of a downturn in global growth. The U.S. services sector expanded in April as new orders and employment accelerated, but the growth outlook dimmed on another report showing private employers hired the fewest number of American workers in three years last month. A higher U.S. currency makes dollar-denominated commoditie