greenhouse gas emissions, or eight years worth, could be prevented from being released over the next four decades by setting tougher standards on air conditioning appliances, a new study has found.Published Friday by the United Nations Environment Programme (UNEP) and the International Energy Agency (IEA), the study found that stringent actions to make air conditioning systems more effective could reduce between 210 to 460 billion tonnes of carbon dioxide by 2060.According to the report, countries could achieve the change by regulating the reduction of climate-warming refrigerants like hydrofluorocarbons (HFCs) — potentially avoiding as much as 0.4 degrees Celcius of global warming by the end of the century.