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Although we have noticed an increase in our overall energy consumption of 4.2% since 2012, some of our affiliates who are implementing Energy Efficiency in Buildings (EEB) and Green car projects have experienced a decrease. For instance, our affiliates in Belgium and Australia have decreased their energy consumption by 2% and 3% respectively. Some examples of energy conservation projects are presented in our 2013 Sustainability Highlights.
We have also noticed a decrease in the energy consumption of our buildings covered by the WBCSD EEB manifesto. Out of the 22 buildings covered since 2010, half show a significant reduction in energy use per square meter, four have already reached their 2014 target of a 10% reduction against a 2010 baseline and two are close to achieving this.
Energy consumption related to our vehicle fuel use has increased by 6.1% since 2012, which is in line with our revenue growth. This figure is in part explained by better reporting from some of our affiliates following sustainability audits conducted in 2013, and in part by the expansion of our fleet.
Energy consumption related to non-transport fuel use decreased by 13.4% in 2013. Factors explaining this decrease include a greater reliance on electricity rather than diesel generators due to a more reliable national grid supply in some of our emerging markets, and the downturn in the mining sector has reduced activity in some of our laboratories.
Electricity consumption increased by 9.9% to 278 million kWh. This increase can be explained by economic growth in some affiliates, especially emerging markets, as well as by acquisitions conducted in 2013 and 2012. The relocation of one of our offices has also affected the reporting of this figure and performance.
CO2 emissions deriving from offices and laboratories decreased by 4.7% and 5.5%, respectively. This comparison uses the original scope of our Energy Efficiency in Buildings program to give a like-for-like comparison with a revised methodology; in 2013, the scope of this program has been extended to include 12 additional buildings. The results show that the new facilities tend to be less energy intensive.