This article analyses whether benefits arising for human resource management from environmental management activities drive environmental management system implementation. Focusing on employee satisfaction and recruitment/retention, it tests this for German manufacturing firms in 2001 and 2006 and incorporates a rare longitudinal element into the analysis. It confirms positive associations of the benefit levels for both variables with environmental management system implementation on a large scale. Also it provides evidence that increasing levels of environmental management system implementation result from higher economic benefits in the human resource domain. In doing so the article supplies needed quantitative evidence on important aspects of how sustainability relates to human resource management.