http://www.direct.gov.uk/en/Environmentandgreenerliving/actonco2/DG_067197
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Cambio Climatico y Salud
Anexo I WHO
http://www.futurenergia.org/ww/es/pub/futurenergia/chats/carbon_imprint.htm
http://www.mycarbonfootprint.eu/index.cfm?language=es