Increasing energy efficiency is one of the most important ways to reduce energy-related pollution while also delivering economic benefits and improving quality of life. For some countries, efficiency can improve energy security by reducing dependence on fossil fuel imports. Efficiency has the potential to slow the growth of energy demand to allow rising clean energy supplies to make deep cuts in fossil fuel use. The International Energy Agency (IEA) estimates that 40% of greenhouse gas emission reductions needed to fulfill the Paris agreement can be achieved by increasing energy efficiency. Ambitious energy pathways in line with Paris show energy usage to remain around the same between 2010 and 2030, and increase slightly by 2050.