Some do and others do not, however it is a very complex issue and needs more space than we have here. In principle all refrigerants handled by competent companies and technicians will never be released to the atmosphere so will not deplete the ozone layer. Because accidents happen, alternative refrigerants are being developed all the time, but it is important to note that refrigerants are not a major problem as many other contaminates cause global warming problems. Primary problems are caused by burning fossil fuels, e.g. petrol diesel, oil etc.
Posted in: Regulations