The European Commission's Directorate-General for Energy and Transport develops ans implements European Union policy in these closely linked areas. The 2000 Green Paper entitled 'Towards a European strategy for the security of energy supply' analysed Europe's structural weaknesses in this field: energy consumption is rising, while the EU is becoming increasingly dependent on external sources of energy. At the same time, to respect its commitments under the Kyoto Protocol, the EU must reduce its production of greenhouse gases. The Green Paper proposes a strategy to reduce energy consumption in... Europe, through improved energy efficiency and market integration as well as to increase the use of renewable energy sources. Improving the trans-European energy networks is a crucial element in the overall strategy for improving the efficiency of Europe's energy systems, increasing security and flexibility of energy supply and transmission networks, and supporting economic and social development across the Union.