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Regional effects of global warming. Global warming, Greenhouse effect, Greenhouse gas, Carbon dioxide, Water cycle, Evaporation, Precipitation (meteorology), Ocean current, Current sea level rise, Ice sheet, Ice cap, Glacier, Arctic shrinkage, Retreat of glaciers since 1850, Shutdown of thermohaline circulation… More >>
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Evaluates the risks to human health and the environment posed by two partially halogenated chlorofluorocarbons: dichlorofluoromethane (HCFC 21) and chlorodifluoromethane (HCFC 22). These two methane derivatives were selected for evaluation because of their potential use as substitutes for those fully halogenated chlorofluorocarbons that are being phased out as a result of the 1987 Montreal Protocol on Substances that Deplete the Ozone Layer. The evaluation is intend… More >>
» Read more: Partially Halogenated Chlorofluorocarbons : Environmental Health Criteria Series No 126
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Experience the American Journey through our country’s visual heritage in this historical recording provided by the National Archives of the United States.From the U.S. Bureau of Mines.This historical recording from the National Archives may contain variations in audio and video quality based on the limitations of the original source material.The content summary for this DVD is adapted from an historical description provided by the government agency or donor at the time of pr… More >>