Ambitious energy efficiency policies can keep global energy demand and energy-related carbon-dioxide (CO₂) emissions steady until 2050, according to a new report by the International Energy Agency. Perspectives for the Energy Transition: The Role of Energy Efficiency shows that despite a near-tripling of the world economy and a global population that increases by nearly 2.3 billion, end-use energy efficiency alone can deliver 35% of the cumulative CO₂ savings through 2050 required to meet global climate goals. Global energy demand grew by 2.1% in 2017 according to IEA estimates, more than twice the growth rate in 2016. At the same time, global energy-related CO₂ emissions increased for the first time in three years, as improvements in global energy efficiency slowed down dramatically to 1.7%.