OTTAWA -- A coalition of environmental groups and firefighters are calling on the federal government to ban flame retardants they say are toxic and pose a serious health risk. The group of chemicals are called polybrominated diphenyl ethers, or PBDEs, and are commonly found in many consumer products, such as the casings of television sets, curtains and carpets. Numerous scientific studies indicate these chemicals are linked to serious health issues, including neurological and reproductive problems, said Lisa Gue, environmental health policy analyst with the David Suzuki Foundation. "We are calling for all chemicals in this class ... to be banned,"...