This REEEP report gives a brief and comprehensive overview of the status of energy efficiency in buildings, industry, transport and agriculture. It focuses on the G8 and +5 countries and is presented on the COP14. With this report REEEP intends to make policy and decision makers aware that energy efficiency improvements increase the security of supply and are crucial in mitigating climate change. Furthermore, the report emphasizes that many investments in energy efficiency are cost-effective.