Barcelona (Freddie Mercury and Montserrat Caballé song) Mercury for the task. Caballé became enthusiastic about the project and instead of recording a single, she proposed to make an album, on which Mercury agreed. The song "Barcelona" had to be its opening song, to be completed by 1988, and to be submitted as a candidate for the 1992 Olympic theme (the selection was scheduled for 1988, four years before the Games). The recording was complicated by Caballé's tight schedule. Thus to spare her time, Mercury recorded the song, singing Caballé's part in falsetto. He would then send a tape to Caballé to prepare her for the joint studio
Mercury in fish plant emissions. Chlorine chemical plants use mercury to extract chlorine from salt, which in many parts of the world is discharged as mercury compounds in waste water, though this process has been largely replaced by the more economically viable membrane cell process, which does not use mercury. Coal contains mercury as a natural contaminant. When it is fired for electricity generation, the mercury is released as smoke into the atmosphere. Most of this mercury pollution can be eliminated if pollution-control devices are installed. Mercury in the United States frequently comes from power plants, which release about 50% of the nation's