We therefore maintain an open dialogue with employees, public authorities, customers and suppliers, as well as the public, on all questions of environmental and energy management. energy and the environment Standards-compliant environmental protection The requirements of the ISO 14001, ISO 50001 and ISO 45001 (currently still BH OHSAS 18001) standards provide the framework for introducing an environmental, energy and occupational health and safety management system and therefore for breaking new ground towards personal responsibility and self-commitment.