Zeotropic mixture harmful effects that hydrochlorofluorocarbons (HCFC) and chlorofluorocarbons (CFC) have on the ozone layer and global warming. Researchers have focused on using new mixtures that have the same properties as past refrigerants to phase out harmful halogenated substances, in accordance to the Montreal Protocol and Kyoto Protocol. For example, researchers found that zeotropic mixture R-404A can replace R-12, a CFC, in household refrigerators. However, there are some technical difficulties for using zeotropic mixtures. This includes leakages, as well as the high temperature glide associated with substances of different boiling points, though the temperature glide can be matched to the temperature difference
1987 (What the Fuck Is Going On?) Run-D.M.C. type of old-school rapping"; and "The Penguin Price Guide for Record & CD Collectors" called "1987" an "entirely brilliant example of the art of disc-jockey-as-producer". Giving another retrospective review from across the Atlantic, "Trouser Press" described "1987" as "energetic" and "a loopy dance album that isn't unlike a lot of sampled records, but proceeds from an entirely different cultural understanding." Bill Drummond and Jimmy Cauty were responsible for the concept and production of "1987", its lyrics and the TR-808 beatbox rhythms. Drummond provided rap, and an additional rapper introduced as 'Chike' appears on "Don't Take Five (Take What You