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References

Department of Trade and Industry. Refrigeration and air conditioning CFC and HCFC phase out: advice on alternatives and guidelines for users. United Kingdom. 2000.

Environment Canada. Environmental signals: Canada’s nacional environmental indicator series 2003. Canada. 2003.

EPA. EPA's Report on the Environment: Highlights of National Trends. USA. 2008.

NASA. The ozone hole. Disponible en:
http://www.theozonehole.com/nasa0ct2008.htm Fecha de consulta: 31-08-2009.

OECD. Environment at a Glance. OECD Environmental Indicators. France. 2005.

UNEP.  Production and Consumption of Ozone Depleting Substances under the Montreal Protocol 1986 – 2004. Ozone Secretariat. UNEP. Kenya. 2005.

Semarnat. Subsecretaría de Gestión para la Protección Ambiental. Unidad Protectora de la Capa de Ozono. México. 2009.

UN. Indicators of Sustainable Development: Framework and Methodologies. 2001.

UN. The Millennium Development Goals Report. USA. 2008.

WMO, NOAA, NASA, UNEP y European Commission. Scientific Assessment of Ozone Depletion: 2006. Global Ozone Research and Monitoring Project—Report No. 50. Switzerland. 2007.