Mckinsey global

Unless there is a shift in world energy policies, global energy demand is set to accelerate, putting increasing strain on the world economy and the environment. Yet additional annual investments in energy productivity of $170 billion through 2020 could cut global energy demand growth by at least half—the equivalent of 64 million barrels of oil a day or almost one and a half times today’s entire U.S. energy consumption.MGI research suggests that the economics of investing in energi the level of output we achieve from the energy we consume—are very attractive. With an average internal rate of return of 17 percent, such investments would generate energy savings ramping up to $900 billion annually by 2020. Energy productivity is also the most cost-effective way to reduce global emissions of greenhouse gases (GHG). Capturing the energy productivity opportunity could deliver up to half of the abatement of global GHG required to cap the long-term concentration of GHG in the atmosphere to 450-550 parts per million—a level experts say will be necessary to prevent the mean temperature from increasing by more than two degrees centigrade. Moreover, the opportunities to boost energy productivity use existing technologies that pay for themselves and therefore free up resources for investment or consumption elsewhere.