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http://www.europarl.europa.eu/meetdocs/2009_2014/documents/com/com_com(2011)0571_/com_com(2011)0571_en.pdf
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http://edgar.jrc.ec.europa.eu/news_docs/jrc-2016-trends-in-global-co2-emissions-2016-report-103425.pdf
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https://www.eea.europa.eu/publications/trends-and-projections-eu-ets-2015
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https://cembureau.eu/media/1501/cembureau_cementslowcarboneurope.pdf
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https://www.aitecweb.com/Portals/0/pub/Repository/Area%20Economica/Pubblicazioni%20AITEC/Relazione_Annuale_2015.pdf