A new report from the environmental watchdog raises concerns about a loophole in a treaty aimed at reducing the production of substances that damage the ozone layer and warm the climate. The Environmental Investigation Agency (EIA), an advocacy group, released its report on Tuesday. message , in which it found emissions in the US of substances that are expected to be phased out under the Montreal Protocol. The treaty, signed in 1987, calls for a phase-out of chlorofluorocarbons (CFCs), which are ozone-depleting and potent global-warming chemicals. It is considered a rare environmental success as the ozone layer recovers. (RACHEL FRAZIN)