Heat pump the brand name Freon, a trademark of DuPont. Its manufacture is now banned or severely restricted by the Montreal Protocol of August 1987 because of the damage that CFCs cause to the ozone layer if released into the atmosphere. One widely adopted replacement refrigerant is the hydrofluorocarbon (HFC) known as R-134a (1,1,1,2-tetrafluoroethane). Heat pumps using R-134a replaced R-12 (dichlorodifluoromethane) and have similar thermodynamic properties but with insignificant ozone depletion potential and a somewhat lower global warming potential. Other substances such as liquid R-717 ammonia are widely used in large-scale systems, or occasionally the less corrosive but more flammable propane or
1987 (What the Fuck Is Going On?) this West End musical shit do you? Come and do the new JAMMS [sic] album.'" In 1994, "The Guardian" looked back on the Swedish sojourn as "a grand, futile, attention-grabbing gesture, the kind that would come to characterise [the duo's] collaborative career... "We were being totally stupid about it" Drummond later acknowledged." The JAMs offered what they claimed were "the last five" copies of "1987" for sale at £1000 each in a full-page advertisement in the April 1988 edition of "The Face". Drummond argued that the offer exploited a loophole in The JAMs' agreement with the MCPS: "We were browsing