through Directive 2019/944 The 2004 Gas Security Directive has been intended to improve security of supply in the natural gas sector. Energy efficiency Energy taxation IPEEC At the Heiligendamm Summit in June 2007, the G8 acknowledged an EU proposal for an international initiative on energy efficiency tabled in March 2007, and agreed to explore, together with the International Energy Agency, the most effective means to promote energy efficiency internationally. A year later, on 8 June 2008, the G8 countries, China, India, South Korea and the European Community decided to establish the International Partnership for Energy Efficiency Cooperation, at the Energy Ministerial meeting hosted by Japan in the frame of the 2008 G8 Presidency, in Aomori. Buildings Buildings account for around 40% of EU energy requirements and have been the focus of several initiatives. From 4 January 2006, the 2002 Directive on the energy performance of buildings requires member states to ensure that new buildings, as well as large existing buildings undergoing refurbishment, meet certain minimum energy requirements. It also requires that all buildings should undergo 'energy certification' prior to sale, and that boilers and air conditioning equipment should be regularly inspected. As part of the EU's SAVE Programme, aimed at promoting energy efficiency and encouraging energy-saving behaviour, the Boiler Efficiency Directive specifies minimum levels of efficiency for boilers fired with liquid or gaseous fuels. Originally, from June 2007, all homes (and other buildings) in the UK would have to undergo Energy Performance Certification before they are sold or let, to meet the requirements of the European Energy Performance of Buildings Directive (Directive 2002/91/EC). Transport Carbon dioxide emissions from transport have risen rapidly in recent years, from 21% of the total in 1990 to 28% in 2004. EU policies include the voluntary ACEA agreement, signed in 1998, to cut carbon dioxide emissions for new cars sold in Europe to an average of 140 grams of /km by 2008, a 25% cut from the 1995 level. Because the target was unlikely to be met, the European Commission published new proposals in February 2007, requiring a mandatory limit of 130 grams of /km for new cars by 2012, with 'complementary measures' being proposed to achieve the target of 120 grams of /km that had originally been expected. In the area of fuels, the 2001 Biofuels Directive requires that 5,75% of all transport fossil fuels (petrol and diesel) should be replaced by biofuels by