How to improve energy efficiency? In five years, ISO 50001 on energy management has gained the trust of nearly 7000 organizations worldwide. SubtitlesHow to improve energy efficiency? In five years, ISO 50001 on energy management has gained the trust of nearly 7000 organizations worldwide. SubtitlesHow to improve energy efficiency? In five years, ISO 50001 on energy management has gained the trust of nearly 7000 organizations worldwide. Subtitles