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Many modern refrigerator/freezers have the freezer on top and the refrigerator on the bottom. Some refrigerators must be within certain external temperature parameters to run properly. Typically the volume of a combined refrigerator-freezer is split with 1/3rds to 1/4th of the volume allocated to the freezer although these values are highly variable. More efficient refrigerators were developed in the 1970s and 1980s, even though environmental issues led to the banning of very effective (Freon) refrigerants. Generous storage baskets in the drawer slide out for easy access to items in the back. This method also helps reduce energy consumption, because the refrigerator is above freeze point and can pass the warmer-than-freezing air through the evaporator or cold plate to aid the defrosting cycle.