"Figure 7: Electricity, gas, steam and air conditioning supply is the biggest contributor to total carbon intensity but has experienced a noteworthy decline in its carbon intensity","" "Carbon emission intensity by the main sectors, 1990 to 2017, UK","" "","" "Notes","" "Unit","Thousands tonnes CO2 equivalent per £ million" "","" "Year","Agriculture, forestry and fishing","Mining and quarrying","Manufacturing","Electricity, gas, steam and air conditioning supply","Water supply; sewerage, waste management and remediation activities","Transport and storage" "1990","0.8","0.8","0.81","9.45","0.42","1.55" "1991","0.77","0.77","0.86","8.77","0.52","1.6" "1992","0.75","0.77","0.84","8.05","0.51","1.58" "1993","0.79","0.76","0.82","6.97","0.46","1.56" "1994","0.86","0.73","0.79","7.07","0.42","1.49" "1995","0.89","0.71","0.77","6.82","0.38","1.46" "1996","0.94","0.75","0.77","6.39","0.4","1.5" "1997","0.82","0.75","0.75","5.80","0.29","1.36" "1998","0.82","0.75","0.71","5.82","0.45","1.35" "1999","0.78","0.71","0.72","5.31","0.30","1.27" "2000","0.69","0.73","0.68","5.48","0.31","1.23" "2001","0.72","0.78","0.67","5.67","0.31","1.28" "2002","0.64","0.80","0.65","5.48","0.27","1.28" "2003","0.74","0.78","0.67","5.70","0.24","1.27" "2004","0.75","0.82","0.66","5.60","0.25","1.30" "2005","0.69","0.88","0.65","5.66","0.27","1.29" "2006","0.71","0.86","0.62","5.94","0.26","1.18" "2007","0.72","0.88","0.61","5.76","0.24","1.17" "2008","0.65","0.91","0.59","5.53","0.20","1.17" "2009","0.68","0.98","0.56","5.00","0.21","1.21" "2010","0.69","1.01","0.55","5.02","0.22","1.21" "2011","0.64","1.04","0.52","4.94","0.21","1.21" "2012","0.68","1.09","0.51","5.44","0.21","1.14" "2013","0.66","1.09","0.53","5.17","0.21","1.09" "2014","0.64","1.09","0.51","4.79","0.22","1.08" "2015","0.65","1.10","0.50","4.22","0.23","1.09" "2016","0.73","1.08","0.47","3.43","0.25","1.10" "2017","0.72","1.13","0.46","3.16","0.26","1.04"