This document aims to provide the rationale for action to improve health through healthy environments, and an overview of key actions to take. It aims to support policy-makers and others who can influence health determinants to navigate through the various environmental health areas. These actors can thus obtain a brief overview of preventive, intersectoral action in this area to achieve sustainable health gains and reduce health care costs. The document provides an initial overview and overall policy directions, and refers to more detailed information for the next steps.