The European Union aims to reduce greenhouse gas emissions by over 30% by 2020 through energy efficiency measures. By analyzing the EU's energy system, researchers found that these reductions are feasible, cost-effective, and impactful in preventing dangerous temperature increases. They highlight the importance of energy efficiency across all sectors and member states to achieve this goal. Policies such as the EU Emissions Trading System play a key role in reaching these emission reduction targets. The study shows that strict targets and actions are essential to curb global warming and that the EU can lead the way by committing early to significant emissions reductions.