The Industrial Revolution led to significant environmental problems due to uncontrolled use of natural resources and pollution. This pushed nations to enact environmental legislation in the 1970s to protect the environment. The ISO published the ISO 14001 standard in 1996 to help organizations develop environmental management systems and demonstrate sound environmental performance in compliance with legal requirements. Over 150,000 organizations worldwide have been certified to ISO 14001. PECB offers training and certification services to help professionals and organizations implement ISO 14001 environmental management systems.