The economic and environmental payoffs from efficiency can be very large, but they can only be maximised by a comprehensive strategy for designing and operating systems. Ed Crooks, the FT's US industry and energy editor, visited the Empire State Building to see what can be achieved.<br /><br />Subscribe to FT.com here: http://bit.ly/2GakujT<br /><br />Subscribe to the Financial Times on YouTube: http://bit.ly/FTimeSubs<br /><br />For more video content from the Financial Times, visit http://www.FT.com/video<br /><br />Twitter https://twitter.com/ftvideo<br />Facebook https://www.facebook.com/financialtimes
